the only '042' I'm seeing on that list that makes any sense to me would be..
P0042 – Heated oxygen sensor (HO2S) 3, bank 1, heater control-(Possible Cause)-circuit malfunction-Wiring, HO2S, ECM
don't take that as gospel or anything but you could check the plug connection and clean up terminals at least, that wont cost anything to rule out
not sure if that would cause limp mode or just the warning light
there are methods of testing them with a voltmeter but I find that a bit inconclusive tbh, I had a scooby which threw up this fault, tested fine but when I replaced it the fault went away
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V70 '01 auto petrol 2.4 (140) 70k
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mini project - link
Last edited by stuart bowes; May 17th, 2021 at 10:03.
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