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3 warning lights on dashboard


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This has been an ongoing problem on my C1 2015 model since before 2020. After going to 2 different garages with the problem and these garages only fixed the problem temporarily I decided to take it to my main Citroen garage to get a diagnostic test. They found that I needed a new oxygen sensor cable and I had this fitted by my own mechanic who has looked after my cars for years but within 24 the 3 lights came back on. I took it back to Citroen again to then be told it was the ECU board and this would cost £1700. I then took it to another garage who specialises in Citroen to be told the oxygen sensor was wired up wrong and they fixed the problem yet again. The lights did not come on for a good 4 months but then the lights came back on. I then took it to another garage and they said it was the oxygen sensor cable again so I had it changed yet again. Another 3 weeks passed with not lights coming on but again today the dreaded 3 lights have appeared yet again. Has anyone had this problem at all. As a 6 year old car that has done less than 25,000 miles I’m quite annoyed this keeps happening and costing me every time someone fixes it. Any help would be very grateful.

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Do you have the fault codes the garages have read from the car, if so, what were they ?

I would buy your own fault code reader, you can get one for around £35 that will also give live data. With this you can read the fault codes to see what they say is wrong and look at the data from the sensor to see if it is faulty and then delete the code. Then see if it comes back again which it might not for a few weeks as you are finding. I would also have a good look at the oxygen (lambda) sensor wiring to see if it is catching and getting damaged and also check the cable connections. Note there are 2 of these sensors with one on either side of the exhaust catalyst. The one on the inlet should switch constantly around a value of 1.0 and the outlet one should be constant unless there is a fault with the catalyst or maybe the sensor. An example of a code reader that gives some live data https://www.gendan.co.uk/product_FXNT200.html

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Unfortunately I have no fault codes. Citroen are very secretive about there paperwork and don’t give you any information only a quote for the part you need and the price. The garage I just went to showed me the readings when it was at 2000 revs but they said the fault came up as the oxygen lead yet again so they replaced that part. Will give it a go with what you’ve suggested and that’s for the reply.

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