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Discussion Starter #1
Need some clever people please!

We have had my wifes 206 1.1 petrol zest from new.

Coming up for 15 years and very low mileage i.e., 34k.

Very reliable, serviced and mot every year by main dealer.

Circa 6 months ago the amber engine warning light came on. For first few weeks it would come and go but has since stayed on all the time.
Car has performed as normal for last 6 months.

In the coming weeks the MOT is due and because warning light is a failure I thought should get it checked out.
I have been loyal to main dealer and they have treated me well over the years and they have diagnosed the problem FOC.

3 codes were stored all related to “upstream oxygen sensor” and they say this will need replacing at service/mot.
At this point I am 100% behind this, but there is a fly in the ointment!!

Obviously the diagnostics has cleared the fault and since leaving the dealer the light has not come back on. An MOT carried out now would not fail the car for a warning light showing.

This is where my knowledge of these things end!
3 questions if I may and I do understand that answers will not be definitive and just looking for likely outcome.

I understand this warning light is linked to emissions as is the sensor in question. So first question is if the warning light is not coming back on does this mean it was a temporary problem that has gone away?

Second question is if the emissions light has been on does point to an MOT failure on the emissions element of the MOT?

Third question, I have not been quoted for the sensor replacement yet. What is a reasonable price to pay a main dealer/independent garage using reputable parts?

Thanks in advance for any views.
 

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1. Sometimes specific conditions cause a fault to be logged, if the fault is reset it might come back it might not. No guarantee either way.

2. If the engine management light remains on then it is now an automatic fail of the MOT, regardless of cause.

3. Sorry, no idea of cost. But a reputable independent will almost certainly cost less. The O2 sensors are not that expensive, so it depends on the time taken.
 

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Personally, I would have it done before the MOT to be on the safe side as I don't think it would be that expensive a job, it would be sod's law for the light to come on just when they start the test!
 

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There is no emission light its simply an engine fault light The sensor may well be getting weak or the cat is not working well due in part to the lack of use but if it goes for an mot with no engine light on it should still pass.
 

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Discussion Starter #5
Thanks for the replies to date.

I have asked the dealer the replacement and fitting cost of the O2 sensor and am told 190 to 200. Does seem the going rate at a main dealer?

I guess the original question that I have not framed very well is as follows. If the sensor is faulty and needs replacing, does this mean that the regulation of air and fuel is incorrect and the mot will fail it on emissions test, regardless that the warning light is no longer showing. Or the fact that the warning light is not now showing means that the air and fuel mixture is now correct?
 

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That car has not been used much,so could be just sooted.I would suggest you put some cat cleaner in the fuel tank and give it an "Italian Tune Up",a good thrashing.
 

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I have asked the dealer the replacement and fitting cost of the O2 sensor and am told 190 to 200. Does seem the going rate at a main dealer?
Yep, the genuine Peugeot part is expensive. There are much cheaper third party O2 sensors available from £20.

I'd probably go in the middle and get a good branded one from Euro car parts when there's a sale on.
 

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oldboy, There are plenty of very good small independent Peugeot/Citroen specialists around.They will fit top quality O/E parts and charge a lot less than £100 an hour. There may be one near you? they could also be a MOT station?
 

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Newby to Peugeots here, but experienced mechanic, I would if the light isn't on put it in for MOT, see what they find, the odds are it won't fail emissions if the lights not on, then at least you can shop around to find a cheaper place or do it your self if it fails on something else, but passes on the co2 levels, then that needs to take priority.
 
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