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Author Topic: fuse protection for lambda sensors?  (Read 995 times)

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ndmv6

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fuse protection for lambda sensors?
« on: 10 September 2011, 19:19:32 »
ive a 2.2 petrol auto omega,are there any fuses protecting the lambda sensor circuits?ive now got a code of p0135 showing after fitting a new lambda downpipe sensor...the old unit which i presumed was faulty showed as p0130.
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freecall666

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Re: fuse protection for lambda sensors?
« Reply #1 on: 10 September 2011, 23:35:45 »
Ive seen some in the ecu, on mine but don know about yours, but sensors dont have a lot off power going to them, have you looked at the wiring and checked it to the ecu?
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ndmv6

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Re: fuse protection for lambda sensors?
« Reply #2 on: 12 September 2011, 09:21:07 »
yeah,checked wiring and earths,guess ive just got yet another faulty lambda sensor...doh...
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Marks DTM Calib

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Re: fuse protection for lambda sensors?
« Reply #3 on: 12 September 2011, 09:32:06 »
If its an aftermarket sensor then I am not surprised at the code that is being raised.
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Abiton

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Re: fuse protection for lambda sensors?
« Reply #4 on: 12 September 2011, 09:58:54 »
Are the heater circuits fused? Relayed?
A few amps there presumably, for a while at least?
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Kevin Wood

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Re: fuse protection for lambda sensors?
« Reply #5 on: 12 September 2011, 10:14:14 »
Quote
Are the heater circuits fused? Relayed?
A few amps there presumably, for a while at least?

Driven directly by the ECU on a 2.2 IIRC. Presumably the ECU includes some current limiting. At any rate, the ECU would store a fault code if the heater circuit was faulty.
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Abiton

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Re: fuse protection for lambda sensors?
« Reply #6 on: 12 September 2011, 10:54:44 »
OP's ECU is reporting a P0135 though.
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Kevin Wood

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Re: fuse protection for lambda sensors?
« Reply #7 on: 12 September 2011, 11:04:18 »
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OP's ECU is reporting a P0135 though.

Yes, of course. I knew that all along. :-[

As the lambda sensor is the item that's been changed, that's what I would suspect. As Mark says, if it's an aftermarket or "generic" sensor it might not have the resistance the ECU is expecting to see.

Might be worth comparing new and old with an ohmmeter (the two grey wires are normally the heater).
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