Question about Volvo XC70

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H02s sensors replaced

My 1997 850 Volvo had a code P0250 so the mechanic changed my rear sensor and my front sensor. I heard you are not suppose to touch or replace the rear sensor so what is going to happen to my car?

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Probably nothing . Sensors can be replace at any time because they are prone to failure . providing they are replaced using the correct tools and care is taken not to damage the wiring there will be no problem

Posted on Mar 26, 2014

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Rear heated oxygen sensor


The rear oxygen sensor is used to imply catalyst damage has occurred. This is done by having an upstream (front) oxygen sensor and a downstream (rear) oxygen sensor. The front sensor will jump quickly between .1 and .9 VDC generally and the rear will do so much more slowly. If the rear sensor\'s activity closely mirrors that of the front, one could imply that catalyst damage has occurred (such as during a prolonged misfire condition where large amounts of unburned fuel enters the catalyst and overheats it), puts the system out of closed loop operation and turns on the MIL.



The details below do not cover all possibilities here, just the most common ones that I have seen over the years;



Usually, that sensor is replaced when a MIL code is set for \'catalyst inefficiency\' is set. This is the first step to ruling out the catalyst as truly being failed. Unless another code is set and the MIL is turned on, nothing strange should happen to your car.



To check, connect an OBDII scanner to your car and look for P0130 codes (o2 sensor failure), P03xx codes (misfire conditions) and catalyst codes (see your manual for the exact codes). Taken together along with the freeze frame data, have the vehicle smog tested. Smog testing just checks for high VOC output along with CO output (CO is not a VOC). One could then assume that the catalyst or other emission control system could be at fault.



Other things that could cause this are lean/rich codes (generally P0172) indicating the MAF is dirty or faulty. Always check and clean the connector going to the MAF before condemning it and clean the MAF itself with MAF cleaner (not brake or electronic cleaners, they are too hard on the film) and see if the performance improves.

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hi
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I have code: 280a,front oxygen sensor code on my 1999 volvo s80 t6. can this mean that it is dirty or does it need to be replaced?


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1 Answer

PO 722 1238 137 1618 1132


1132-This Relates to Heated oxygen sensor (H02S) 1, bank 1/heated oxygen sensor (H02S) 2, bank 1 - signal incompatibility
1618-This Relates to Cable fault between AW 50-Q2 TCM and Motronic 4.4 ECM (lamp lights)
1238-This Relates to Turbocharger (TC) boost pressure sensor - boost control malfunction
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1 Answer

Codes 1238 1618 1132


I would assume that these are 'P' codes.Please advise if they have a different letter prefix or nothing at all.
P1238-This Relates to Turbocharger (TC) boost pressure sensor - boost control malfunction
P1618-This Relates to Cable fault between AW 50-Q2 TCM and Motronic 4.4 ECM (lamp lights)
P1132-This Relates to Heated oxygen sensor (H02S) 1, bank 1/heated oxygen sensor (H02S) 2, bank 1 - signal incompatibility
Try deleting them all first then just focus on the ones that wont reset,followed by those that come back on after driving or using that area.
Hope this helps you.

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1 Answer

Codes 1132, 1238, and 1618


All are P codes
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1618-This Relates to Cable fault between AW 50-Q2 TCM and Motronic 4.4 ECM (lamp lights)

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Sounds like a bad oxygen sensor. Consult a mechanic for troubleshooting.

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