Sign in to follow this  
BlackBrick

O2 sensors

Recommended Posts

1997 850

I keep getting CELs P0130 and P0135 for the O2 sensors.

I've replaced both the front and rear ones, but still get the CELs.  What else could it be?

 

Share this post


Link to post
Share on other sites

Both those codes refer to the front O2 sensor so not sure why you replaced the rear too?

My guess is you may have an intermittent open circuit in the front O2 sensor wiring to the ECU.  Main suspect would be the ecu side wiring near the connector.  Ohm it out from the ecu pins to the O2 connector harness side.

The front O2 two pins at the ecu are:

A32: + or signal

A33: - or reference

If that checks out, might be worth trying a known good ecu.

 

Related links:

https://www.obd-codes.com/p0133

https://www.obd-codes.com/p0135

http://volvospeed.com/vs_forum/topic/97997-help-p0130-error-nightmare/

Share this post


Link to post
Share on other sites

thanks ...turned out, the front O2 sensor was bad.  It worked temporarily, but then kept throwing the code because that push in switch lever that connects the two came undone.  This time, I put a zip tie around it and all is good.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this