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  1. #1
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    egt sensor location on '03 S3

    hi,can anyone tell me if this is the egt sensor on my car ?(circled in red) or is it the lambda?reason i ask is i saw another thread on this forum where the egt sensor has a black box at the end of the cable,the one on mine doesnt so im thinking it could be the lambda?also has anyone got any recommendations on where to buy a new egt sensor?cheapest i can get one is 145+vat from audi


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    MUSH's Avatar
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    Thats the wideband lambda probe.

    The EGT sensor is fitted into the housing directly on the the k04 turbo. A swine to get to!!!

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    oh great,can you get to it from the top of the engine or will i have to get underneath and get dirty?

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    It is possible from up top,
    A bit of a bugger but if you go round the gear box side of the engine... follow a thin braided wire around the side of the block to the turbo... i think its something like a 13mm or 15 mm spanner size. but i cant remember.
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    does anyone know whereabouts the connector is situated for this?i have found the sensor on the turbo but i can only see where about 6 inches of the cable go to,seems to head towards the engine??does the turbo inlet hose have to come off to get this barsteward changed?

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    EGT probe is in the back of the turbo and requires a 17mm spanner... this can be got to from the top of the engine... the black box of tricks the EGT probe connects too is bolted under the inlet manifold... this can be got to by removing the trim panel in from of the inlet mani revealing the plug... you need to remove the metal plate to remove the black box.. 2 x 5mm allen bolts for the plate, 2 x 5mm allen bolts for the black box... the probes braided cable goes around the gearbox side of the engine and is a bit of a pig to undo..

    The part (if your are replacing it) is around 180

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    ah right so thats the same bit of trim you take off to get to the thermostat then?i had that off yesterday aswell

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    yarp

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    180! jesus!
    any things to worry about running a car with egt sensor fault?

  11. #10
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    Quote Originally Posted by superkarl View Post
    180! jesus!
    any things to worry about running a car with egt sensor fault?
    Yes... runs as rich as f00k when faulty or disconnected.... crap fuel consumption and low power...

    I buggered mine but found one for 50 on ebay.de... I couldn't even get it discounted through TPS... cost price is not much less...

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    thanks for that. had no idea it would cause such things, i just thought the mpg was like that haha.

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    With my faulty egt average consumption was 12l/100km(quarter tank 100km) and thats on the highway with 25% throttle. Before it was faulty i got between 2.9-7.5l/100km. Quarter tank 220km. My buddy repaired mine but it only lasted a week, he says the problem is vibration causes the solder to break away. Going tomorrow morning to audi to order a new sensor(225 where i live) . Also noticed the car loses alot of power when the egt is faulty
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    when ecu see's implausable type sensor issue from egt, or intermittent connection.... it fuel dumps, which murders power and economy

    watch block 112 kick in and 031 go mega rich when it gets into this fault condition
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    i may remove and see if there is any damage to wiring that may be fixed first.

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    When booting it the other day WOT highish revs 4k+ in 4th gear+ felt like I'd hit a limiter or wheel spinning (but not doing either) until I caught the engine light flashing.
    At first thought might be coilpacks on the way out but when I got home did a scan and got the following codes:

    17861 - Exhaust Gas Temp Sensor 1 (G235): Open or Short to Plus
    P1453 - 35-00 - -
    16684 - Random/Multiple Cylinder Misfire Detected
    P0300 - 35-00 - -
    16687 - Cylinder 3: Misfire Detected
    P0303 - 35-00 - -
    16686 - Cylinder 2: Misfire Detected
    P0302 - 35-00 - -
    Readiness: 0000 0000

    Cleared them all and rescanned again this evening and although I havent done any more WOT runs have got the EGT fault back.
    Does the ECU missfire to protect the turbo and CAT as it doesnt have reliable EGT sensor information or could the coilpacks be going aswell?

    Anyone got a pic of the plug for the EGT sensor if its under the intake manifold as was under there the other day changing the thermostat so hopefully the plugs just come loose!

    180 for a new one anyone got a part number so I can hunt on ebay?

    According to this link The Audi TT Forum :: View topic - EGT sensor
    it could be a fuse, any ideas which ones to check?
    Last edited by thorsy22; 11th January 2011 at 23:35.
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    The egt is on the turbo housing not intake

  18. #17
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    Quote Originally Posted by s3dave View Post
    The egt is on the turbo housing not intake
    I understand the probe itself is on the turbo but what people are saying is that it plugs into the cars electronics somewhere under the intake manifold, just wondering if anone had a pic to show where this is.
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  19. #18
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    ahh i see, there are a few connectors above the thermostat housing, deep under the intake manni,not sure if one of them is the one...

  20. #19
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    The connection block is literally bolted to the underneath of the inlet manifold ( lookin at my BAM engine ). The plug to the ECU is facing the front of the car, just an inch or so to the left of the dipstick, with the braided cable going off in the other direction.

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    Quote Originally Posted by tufftybloke View Post
    Yes... runs as rich as f00k when faulty or disconnected.... crap fuel consumption and low power...

    I buggered mine but found one for 50 on ebay.de... I couldn't even get it discounted through TPS... cost price is not much less...

    <tuffty/>
    my car is doing all of these mate but got maf sensor fault need new lambda sensor for down pipe and egt sensor 1 would one of them course that or all
    need changing car driveslike hell and drinks so much tar
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    Luckily for me I didnt plug the sensor back in properly after putting everything back in after replacing my thermostat the other day and it had come off, DOH!

    For those that need an EGT found this on ebay AUDI S3 / TT / LCR 225BHP 1.8T K04 - 023 EGT SENSOR on eBay (end time 14-Jan-11 01:46:43 GMT)
    2001 Audi S3 - AMK 210bhp
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  23. #22
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    iv got the amk engine is these the one with the probe or not tar guys seen etg sensor on ebay for 30
    350bhp & 316ftlb BBT new k16 7+7 blade hybrid turbo, Welly cooler, jetex filter, relentless ported v3 manifold 3" downpipe & de-cat, liquid gauge, r32 rear arb, AGU ported and polished Head, 550cc injectors, kw v2 Coilovers, s3dave tie bars & heat sheild, milltek cat back, I.E forged rods, brembos, inline fuel pump, v3 badger 5 tip, devils own WMI kit, AGU pistons, rear grooved discs & brembo pads, ds2500 pads & EBC ultimax disc, stack boost gauge

  24. #23
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    I have an AMK engine so yes.
    2001 Audi S3 - AMK 210bhp
    Tarox F2000 discs front - Tarox 401 Rallye+ pads
    Tarox F2000 discs rear - Tarox 112 Strada pads
    Goodridge brake lines
    TT pedals
    N249 bypass

    Finally back on the road, have a HUGE list of mods and things to do now!


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    these egt sensor will they cause the car to idle rough and engine to shake about a bit.. i have this code come up on vag com did have lambda sensor 1 in the manifold but changed this and code has gone and not came back also cleaned the throttle body. and this code keep coming up and car is rough on idle when warm . any one else have same problem when they had this code

  26. #25
    S3 Nattie's Avatar
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    Quote Originally Posted by tufftybloke View Post
    Yes... runs as rich as f00k when faulty or disconnected.... crap fuel consumption and low power...

    I buggered mine but found one for 50 on ebay.de... I couldn't even get it discounted through TPS... cost price is not much less...

    <tuffty/>
    Just wondering do you have any links for the EGT sensor. I just been out logging and keep getting the code.

    Explains why im getting a stutter and really bad MPG.
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    Quote Originally Posted by S3 Nattie View Post
    Just wondering do you have any links for the EGT sensor. I just been out logging and keep getting the code.

    Explains why im getting a stutter and really bad MPG.
    No mate... bought it ages ago... think I just searched on Audi S3 or the part number which can be found on the black box under the inlet mani... it was the only one I found at the time but thats not to say its the only one on there...

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    Ok thanks anyway Paul. Really hope its not the sensor as they are expensive, will have a look at the sensor and wire tomorrow. Will keep a nose out on ebay to see if one comes up cheap.
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  29. #28
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    I just been out logging my lambda and my exhaust gas temps and there were as I expected with this EGT fault I got.

    On cruise my temps are around 600-700+ degrees but as soon as my foots down it goes straight to 1100 degree which I believe is the limit on vag com. I doubt my temps were that high but the sensor is giving duff readings. My fuelling when really rich too, 0.7 on a standard map and my boost dropped straight away and felt flat until the exhaust gas temps lowered.

    Im just wondering does anyone know where I can get a cheap EGT sensor from or if they have one spare they want rid of.
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  30. #29
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    Quote Originally Posted by S3 Nattie View Post
    I just been out logging my lambda and my exhaust gas temps and there were as I expected with this EGT fault I got.

    On cruise my temps are around 600-700+ degrees but as soon as my foots down it goes straight to 1100 degree which I believe is the limit on vag com. I doubt my temps were that high but the sensor is giving duff readings. My fuelling when really rich too, 0.7 on a standard map and my boost dropped straight away and felt flat until the exhaust gas temps lowered.

    Im just wondering does anyone know where I can get a cheap EGT sensor from or if they have one spare they want rid of.
    Wow! tbh mate other than a breakers/ebay you are unlikely to get one other than new from a dealer... there is now margin in them at the dealer (I have asked them and enquired with a mate who gets the best discount from TPS)... they are around the 170 quid mark all day long for whatever reason... prob due to the controller being part of the probe as the probe is nowt special just a type k thermocouple...

    I still have my old EGT probe kicking around and the only problem with it was when I tried to open the controller looking to see if there was an issue with the thermocouple I managed to knock a surface mount resister off the potted (flexible potting compound) pcb... it works intermittently but I was planning on getting the thing repaired as that is all thats wrong with it...

    If you want to pop up to Bill's place one Saturday and try it you are welcome...

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    Cheers for that, if I have no luck finding one I may give your one a try. It such an expensive part for what it is and going from my data today its definitely not right. Im going to have a look at the wiring and measure the resistance too.

    I was surprised with the reading, on one point the ECU was requesting a lambda of 0.649 and my boost dropped by about 3-4 psi from looking at the gauge and just felt really flat. The temp readings were also quite mad, going from 600+ degrees straight to 1100 degrees. I would have thought around 900 degrees would be acceptable on a remapped car.

    Would you say something in the controller is broke or the actual probe you think. I might open mine up and see if there is anything obviously wrong.
    Last edited by S3 Nattie; 16th April 2011 at 19:33.
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  32. #31
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    EGT protection based on EGT probe readings kick in at 925 deg at which point it goes bonkers rich and the ECU switches off lambda correction..

    The controller is pretty robust tbh and isn't in a place that it is likely to get damaged... the probe however is more likely to be the culprit here especially as you are getting readings....

    The probes connection is potted inside the box which is one of the reasons I tried to open it...

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  33. #32
    S3 Nattie's Avatar
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    Ye I thought it was around that figure when the ECU protection kicks in, I assume 1100 degrees is vag coms limit then. This probably explains the reason why my mpg is so low and why my performance is only there once and then feels flat. I sometimes get a stutter/hesitation and my dv randomly dumps when pulling off after a quick blast. Would you say thats were my ECU has dumped a load of fuel in causing the slight stutter.

    I think its just given up the ghost now as its been running a bit weird for a while but thought it was the maf even though it was giving ok readings. It hasnt been touched or anything recently and like you say the controller is in a secure place, I think im going to open it up first and have a nose.
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    at 1100 deg the ECU should throw a fault code indicating that max EGT temp has been exceeded (or upper limit or something...) I had this code while running my OEM back box when I had my GT30 mapped first time around... all better now of course

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    This is the code Im getting;

    17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal
    P1455 - 35-10 - - - Intermittent

    Il have a look at the wiring and that tomorrow and try and open it up and go from there. Its typical when I have some spare cash for mods something has to come up lol.
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  36. #35
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    Quote Originally Posted by S3 Nattie View Post
    This is the code Im getting;

    17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal
    P1455 - 35-10 - - - Intermittent

    Il have a look at the wiring and that tomorrow and try and open it up and go from there. Its typical when I have some spare cash for mods something has to come up lol.
    That seems like a wiring or controller fault to me... any other fault codes? generally if there are a few that pop up it could just be a bad earth or a connecter thats shared somewhere...

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    [QUOTE=S3 Nattie;1228327]This is the code Im getting;

    17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal
    P1455 - 35-10 - - - Intermittent

    i got the same fault code at the min i have tryed to clean the probe with wet and dry and carb cleaner cleared code but came straight back..

    an is your car run lumpy when its hot and on idle say you go out drive it for a while come back park up leave it running will it run lumpy..

  38. #37
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    Quote Originally Posted by tufftybloke View Post
    That seems like a wiring or controller fault to me... any other fault codes? generally if there are a few that pop up it could just be a bad earth or a connecter thats shared somewhere...

    <tuffty/>
    I did think the wiring could be at fault because of the implausible signal in the fault code. IRRC there is a earth under the battery. How did you open up your controller, I cant remember but there not screws on it to open it isi.



    [QUOTE=karls s3;1228532]
    Quote Originally Posted by S3 Nattie View Post
    This is the code Im getting;

    17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal
    P1455 - 35-10 - - - Intermittent

    i got the same fault code at the min i have tryed to clean the probe with wet and dry and carb cleaner cleared code but came straight back..

    an is your car run lumpy when its hot and on idle say you go out drive it for a while come back park up leave it running will it run lumpy..
    I wouldnt say my idle is lumpy but when the engine is hot I get a bit of a surge and then a hesitation when pulling off and noticed recently I get a slight pause when changing gear on WOT. It even worst when driving up hill very slow but its intermittent.

    So cleaning the probe for you didnt do anything, have you tried anything else. What size is the bolt if you can remember, 17mm maybe.
    Last edited by S3 Nattie; 17th April 2011 at 11:14.
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  39. #38
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    Quote Originally Posted by S3 Nattie View Post
    I did think the wiring could be at fault because of the implausible signal in the fault code. IRRC there is a earth under the battery. How did you open up your controller, I cant remember but there not screws on it to open it isi.

    The controller is a sealed unit mate... opening mine is how I managed to bugger it up.... you 'should' be able to 'carefully' work around the lip of the 'lid' to remove it but it is glued and I slipped with a small screw driver knocking the resister off the PCB.. the components are potted in a flexible compound so care needs to be taken...

    I would be tempted to try another probe first to rule out the probe itself....

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  40. #39
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    I see what your saying. Im trying to source a cheap second hand one first and if that sorts the fault out il get a new one. 170+ is a bit expensive for a trial and error. If I decide to open it up il remember to be very careful
    For sale

    3" Downpipe and de cat (will be going on ebay soon)
    Autogauge boost gauge
    Chrome Audi Number plate surrounds

    PM for info.

  41. #40
    1st Gear

    Status
    Offline
    Join Date
    Feb 2011
    Location
    southampton
    Posts
    229
    [QUOTE=S3 Nattie;1228579]I did think the wiring could be at fault because of the implausible signal in the fault code. IRRC there is a earth under the battery. How did you open up your controller, I cant remember but there not screws on it to open it isi.



    Quote Originally Posted by karls s3 View Post

    I wouldnt say my idle is lumpy but when the engine is hot I get a bit of a surge and then a hesitation when pulling off and noticed recently I get a slight pause when changing gear on WOT. It even worst when driving up hill very slow but its intermittent.

    So cleaning the probe for you didnt do anything, have you tried anything else. What size is the bolt if you can remember, 17mm maybe.
    hi ,mate yeah its a 17mm spanner easy to do if you take the top off air box.. this is all i tryed i at the min but i think i might need a new one tps quoted 182 inc vat for trade can see any other people doing it tryed euro car parts and gsf they dont reconise the part number ..

 

 
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