On my 2002 Forester, the CEL has been staying on, took it to Autozone they read out a P0136 error code, which is suppossedly a Rear Oxygen Sensor Circuit Malfunction - how difficult are these to replace? I'd like to save a few bux and do it myself if possible. I have also read some posts that seem to indicate the wiring to these sensors will sometimes go bad, throwing the error code. thanks for any help!
Did they clear the CEL and, if so, did it come back on very quickly?
Carl
They cleared it earlier today and it hasn't come back on yet.
Carl 1 Lucky Texan wrote:
I would wait to see if it returns. A cut wire might return immediately, a slow or 'lazy sensor' might come back in a few weeks. It MAY not come back at all. Usually, as for wear, the front sensor goes first - more heat and un-'catalyzed' combustion products hit it first. How many miles on your car?
Carl
Carl, 100,000 miles -
So this is the rear sensor ...after the catalytic c>
All 4 cylinders will show as 'bank one' (1/2 V8) even if they are not inline. Your car MAY have 3 sensors - anyone? - anyways, I's be very tempted to confirm which sensor if possible - sounds like it is getting 'lazy' - you can actually see them 'switch' on an o'scope and maybe some analog voltmeters - google 'lamda sensor' or 'oxygen sensor' . Do not use a voltmeter on them! It is either useless or damaging IIRC.
you might post the code and conditions at
just my $0.02
Carl
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