P0135 O2 Sensor Fault & Engine Light

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SimmoDRZ

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Hi All,

I have searched the forum for this fault code but not much comes up. I have a 2007 D40, ST-X Automatic (Spain build).

I had no issues at all with this before but recently fitted a 3" DEA Exhaust (with CAT & Muffler)… to get rid of the DPF. I fitted 2 of Auggies DPF re-calibrated sensors at the same time.

I now get check engine lights at random times and the code is "P0135" which is an O2 Sensor Fault.

I have reset the computer/fuel pump a couple of times which clears the light and also cleared it via the scan tool also... but it keeps coming back (no limp mode...just CEL).

Questions:
- Do these O2 sensors fail over time and it was just bad timing when fitting new exhaust?
- Is there checks you can do on O2 Sensors to test them?
- Can a free(er) flowing exhaust trigger O2 sensor fault codes?


Cheers,
Simon
 

Old.Tony

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309,000km on my 2009 D40 STX diesel auto and it's heated oxygen sensors are still ok, so it's possible that I'm just lucky there. They are subjected to a fair extreme of temperature. You might check the wiring harness from the sensor, in case that wiring has perished. Otherwise a phone call to auggie to see what he thinks - he's very knowledgeable about our exhausts.
 

SimmoDRZ

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309,000km on my 2009 D40 STX diesel auto and it's heated oxygen sensors are still ok, so it's possible that I'm just lucky there. They are subjected to a fair extreme of temperature. You might check the wiring harness from the sensor, in case that wiring has perished. Otherwise a phone call to auggie to see what he thinks - he's very knowledgeable about our exhausts.
Cheers Tony. I have spoken to Auggie but no real ideas as seems a strange issue. Might just be bad timing with O2 sensor failing at exhaust change time. I've got 275,000km... and the sensor may have copped a little too much of a shakeup during the swap.
I'll look further and keep you posted.
Cheers 👍
 

TravNavD40

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Hey fellas I used to have nothing but problems with my dpf and sensors so I tried the Chip Tune dpf management system wired it up and was simple to do and never had an issue in over 2 years and I've got almost every mod you can think of running 35 psi boost as an everyday run about and almost doubled my fuel economy in the process, just a thought

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