Ford focus fault codes p0036 & p0136

Ford focus fault codes p0036 & p0136

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G321

Original Poster:

607 posts

210 months

Thursday 1st October 2015
quotequote all
Hi, just had the engine light come on and the diagnostic has come up with these 2 codes. I think they both apply to each other as a quick Google search said it was a temperature sensor I think in the exhaust. I had hoped it was just an error and tried to reset the codes both on the diagnostic and by disconnecting the battery for a while but neither have worked. Anybody have an experience of this or any ideas on a cure?

chimp427

9,673 posts

239 months

Thursday 1st October 2015
quotequote all
Both those codes refer to an oxygen/lambda sensor problem in the exhaust system, it has an internal heating element to help it warm up quickly.
Chances are the sensor is knackered, the car may have 2 fitted so a better diagnosis would be to let someone with a more sophisticated diagnostic scanner watch the sensor/s activity.


Edited by chimp427 on Thursday 1st October 19:34

bearman68

4,787 posts

138 months

Thursday 1st October 2015
quotequote all
Bank1 Sensor 2 = downstream O2 sensor has failed. Car will drive fine as it is not a part of the control loop. Don't worry about it and carry on regardless. Or splash £100 and have it changed. There's no realistic repair option on this.

Cheers

G321

Original Poster:

607 posts

210 months

Thursday 1st October 2015
quotequote all
Thanks for the replies guys. I take it would be an mot failure though? Which I'm sure is next month

andyiley

9,927 posts

158 months

Thursday 1st October 2015
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As above, it is not part of the control loop, so I THINK you are ok, but others with more detailed info will be along shortly.

bearman68

4,787 posts

138 months

Friday 2nd October 2015
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Will be fine for MOT, though might show as advisory (assuming it passes it's emission test as any other car would need to)

Cheers

Mr2Mike

20,143 posts

261 months

Sunday 4th October 2015
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The downstream sensor IS used within the closed loop fuel control on some vehicles, so don't assume it's never affects fueling. In these vehicles it is used to optimise the cat operation (e.g. ensure enough oxygen is present) as well as monitor efficiency.

G321

Original Poster:

607 posts

210 months

Thursday 15th October 2015
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Going to try and sort this myself. Had a look underneath and can't see the sensor anywhere. Any ideas before I go and spend £20 on a Haynes manual?

bearman68

4,787 posts

138 months

Thursday 15th October 2015
quotequote all
G321 said:
Going to try and sort this myself. Had a look underneath and can't see the sensor anywhere. Any ideas before I go and spend £20 on a Haynes manual?
It will be downstream of the cat. IIRC the cat is vertically placed coming off the exhaust manifold at the front of the engine. I would anticipate the post cat O2 sensor to be a few inches behind the engine sump, obviously bolted into the exhaust.

But I've had a few beers and wait to be corrected. smile

G321

Original Poster:

607 posts

210 months

Friday 16th October 2015
quotequote all
bearman68 said:
It will be downstream of the cat. IIRC the cat is vertically placed coming off the exhaust manifold at the front of the engine. I would anticipate the post cat O2 sensor to be a few inches behind the engine sump, obviously bolted into the exhaust.

But I've had a few beers and wait to be corrected. smile
I think you're right. I bought an online Haynes manual and that pretty much confirmed it. Look like it might be awkward to get to though