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Oxygen sensor experience 700 1987

posted by  Bill Houghton on  Fri Feb 17 15:12 CST 2006
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last visit: Sat Jun 7 19:06 CST 2014
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Some weeks back, I replaced the front oxygen sensor because the trouble code that showed up from my $150 code reader was consistently "#1 oxygen sensor slow response" - until I got the "#1 sensor no response" code, that is. But the check engine light kept going on, with the "#1 slow response" code reading.

Finally gave up and took it to the dealer. The service writer told me that it's common for the rear sensor to go about the same time and to confuse the front one, thus causing the bad reading, without itself showing up as bad for anyone but the official Volvo code reader. He was right. Some folks on this forum had recommended replacing both sensors - if I had, I'd have saved about $170, between the higher dealer part price and the dealer labor.








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    Oxygen sensor experience 700 1987

    posted by  Will740turbo on  Fri Feb 17 18:54 CST 2006
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    last visit: Wed Oct 22 16:09 CST 2014
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    what kind of crazy 1987 do you have with 1) TWO O2 sensors and that has 2) an OBD2 port???

    There might be an onboard diagnostic cluster (my 90 740T with LH 2.4 does) but I don't know about the 2.2 or Regina etc. This doesn't have an obd connector, but COULD have been connected to a dealer's computer and then sent to the Swedish supercomputer to talk to or even reprogram or some other crazy awesome stuff involving your ECU. I believe this computer has since been decommissioned.

    I think the dealer is yanking your chain- the one attached to your wallet. Perhaps they referred to your AMM as your front sensor or your EGR.

    -Will
    --
    1990 740 Turbo, on its way to stock specs, maybe beyond







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