Fault code issue

[MattW86]

Hi guys, i hav just replaced my post cat lambda sensor as vagcom had brought up fault codes on it. After clearing the codes went to petrol station, after filling up turned ignition boom EML light straight on. Got home cleared it again went for a drive 2hours later no light, i thought sweet sorted.

Got in car this mornin and low and behold EML... Arrrgghh

(i only have vcds lite so used a obd2 code clearer off amazon)

Help!, cheers

Matt

 

[<tuffty/>]

Need to know what the fault codes are...
Category:Fault Codes - Ross-Tech Wiki

<tuffty/>

 

[Rick @ Unicorn Motor Dev.]

It's an indication that the cat is failing, or that you have an air leak in the exhaust system. if you have the car remapped, you can have the sensors coded out.

Rick

 

[MattW86]

Sorry fault codes that are coming up are;

17526
17522

Matt

 

[<tuffty/>]

Sorry fault codes that are coming up are;

17526
17522

Matt

17526 suggests its not connected so a wiring issue maybe?
17526/P1118/004376 - Ross-Tech Wiki

17522 again points to a possible wiring issue especially if the sensor is new...
17522/P1114 - Ross-Tech Wiki

<tuffty/>

 

[MattW86]

Will check wiring again but everything seemed spot on. Would it be difficult to exchange wiring from ecu to post cat area.

Have MOT soon and this could fail me b4 i begin... Got to love cars lol

Cheers for all the info

Matt

 

[Rick @ Unicorn Motor Dev.]

Did you replace with a genuine Bosch sensor?

Rick

 

[MattW86]

No not a bosch unit. Bought a sensor of gsf which was a match for the part no. ETKA supplied me with.

I reset the code before leaving the car in the carpark this morning and when i came back 9 hrs later no eml light car running perfect. I am a bit confused, does the ecu need time to adapt to a new sensor? Its not like the post cat does much bar emissions.

Matt

 

[<tuffty/>]

Sadly pattern sensors tend to be hit and miss as to if they will work... GSF do sell Bosch sensors... I have bought a wideband one from them before... I would suggest taking it back tbh... (if you can of course...)

<tuffty/>

 

[MattW86]

Its my second sensor from them due to the 1st being really short cable wise.

Found a company online called lambdapower who seem to have access to right bosch ones, gsf only had 2 on their system for the S3.

I'll see if the eml comes back tomorrow then make a move.

Cheers for all the help guys.

Matt

 

[Rick @ Unicorn Motor Dev.]

ALWAYS use genuine lambdas.... The rear 02 does actually have some say over the fuel control. The ECU changes its strategy depending if it is configured/coded for the extra sensor.

Rick

 

[MattW86]

Quick update..

Went for a drive earlier and the EML light stayed on after ignition.

have emailed the Lambda-power guys to try get a genuine Bosch unit sorted. For future reference the Bosch part number is 0258 006 335.

Cheers guys,

Matt