Question about 1998 Volvo V70

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Lambda sensor light on, code has been read by garage but non-specific apparently. Light turned off but comes back on after about a week - done this twice now. Fuel consumption unchanged. Garage says poss sensor fault but there are two and could be either at £160 each! Sensor connections are OK.

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  • edward_bearm Apr 23, 2009

    Had check, CO emissions are high and staying there. Now booked in to put scope on sensors to find which one faulty. Seemed to think either could feedback, not just one in front of cat.

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First have an exhaust shop check your flow through the catalytic converter. If you have a bad oxygen sensor with no noticable change in fuel economy or performance, it likely is the one after the Cat. This one just measure performance of the Cat. itself. The one in front of Cat is responsible for adjusting fuel mixture, so if it goes bad, you should have fuel consumption, and other symptoms. The best Volvo service is still done at your Volvo dealerships. Good luck, and thanks for posting. TT

Posted on Apr 21, 2009

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