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P0135 O2 Sensor Fault & Engine Light
  #1  
Old 29-10-2018, 03:41 AM
SimmoDRZ SimmoDRZ is offline
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Default P0135 O2 Sensor Fault & Engine Light

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
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  #2  
Old 29-10-2018, 10:09 AM
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Old.Tony Old.Tony is offline
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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.
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Old 30-10-2018, 01:33 PM
SimmoDRZ SimmoDRZ is offline
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Quote:
Originally Posted by Old.Tony View Post
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 👍
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dea, dpf, exhaust, o2 sensor, p0135

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