PD170 Exhaust gas temp & DPF

[Tek_28]

Hi all, first post so if this is done wrong please let me know!

My engine: PD170 BMN (2008) 65k on the clock

My EGT sensor on bank 1 failed (before turbo?) error code P0546 and I'm looking to replace this myself, I just want to confirm that access to this is from underneath the engine?

Secondly, I assume my DPF light has come on after 2 days of driving with this error code due to it being unable to regenerate. I'm a little worried as the new sensor probably wont arrive until tuesday at the latest and I need my car for work (I'll probably do about 200 miles before i replace the sensor). Will driving within dpf regen specs (higher rpm for 20 mins) help my situation currently or am I going to get a massively clogged dpf?

I have a VCDS coming on monday, and I will be cleaning the EGT sensor today to see if that will alleviate the problem.

I do about 420 miles / week minimum, an hour commute each way, about half of which is motorway based.

Any advice on any of the above greatly appreciated!

 

[aqibi2000]

Pre turbo sensor is on the exhaust manifold, you need a deep 17mm socket with the a slot cut in it using an angle grinder to allow the wire to pass. You can also buy them from eBay as Lambda/EGT sockets.

You’ll sit in the engine bay and find the sensor behind the engine.

Cleaning the EGT does nothing, the type of temperatures that thing faces over time makes the thermocouple wire/weld break. Hence when you rev the car the temperature reading jumps all over the place as it’s an intermittent open circuit inside the can.

 

[aqibi2000]

Small hint to anyone buying these sensors it’s easy to accidentally suspect the wrong one.

Best way to confirm you are going to remove the right one is to trace the sensor to the electrical connector and unplug it.
Then check via VCDS (measuring block : fault code) to see that you have actually removed the one of interest.

 

[Tek_28]

Small hint to anyone buying these sensors it’s easy to accidentally suspect the wrong one.

Best way to confirm you are going to remove the right one is to trace the sensor to the electrical connector and unplug it.
Then check via VCDS (measuring block : fault code) to see that you have actually removed the one of interest.

Thanks for the tip, car went into limp mode today, sensor still hasnt arrived I have access to a VCDS so I'm hoping i can force a regen for now / clear the codes temporarily until the new sensor arrives? With the new regulations it's looking like a pdf delete isnt an option! I have doubts as to whether the forced regen will happen with the faulty sensor / intermittent glow plug light...

Also with the sensor removal, am I right in saying part of the inlet pipe from the air filter to the engine block and the battery are going to have to be removed for me to get to the sensor? I tried getting to it from under the car (just on axle stands) and theres no way i can reach it...

 

[aqibi2000]

Thanks for the tip, car went into limp mode today, sensor still hasnt arrived I have access to a VCDS so I'm hoping i can force a regen for now / clear the codes temporarily until the new sensor arrives? With the new regulations it's looking like a pdf delete isnt an option! I have doubts as to whether the forced regen will happen with the faulty sensor / intermittent glow plug light...

Also with the sensor removal, am I right in saying part of the inlet pipe from the air filter to the engine block and the battery are going to have to be removed for me to get to the sensor? I tried getting to it from under the car (just on axle stands) and theres no way i can reach it...

Nothing needs removing other than the engine cover. You need to sit on the engine and reach.

This applies to Pd170 engines which have the turbo at the top back of the engine.

 

[Tek_28]

Nothing needs removing other than the engine cover. You need to sit on the engine and reach.

This applies to Pd170 engines which have the turbo at the top back of the engine.

Thanks, I'll have a look tonight. Mine does have the turbo in that position.

Just checked on a diagnostic reader and the DPF is over 90% clogged will this even regen after I replace the faulty sensor at this point (with vag-com or italian tune up) or should i shell out the £200-250 to get the DPF cleaned?

What a pain!