Vectra o2 sensor

Jan 04, 2014 4 Replies
H

After lots of OBD faults reported, getting to the bottom of them there is just one remaining possible issue...


1.8 2003 C petrol SRi. Its constantly reporting the O2 bank 1, sensor 1 heater as a pending code, but the MIL doesn't light and the code is not stored. There is only one bank - one front and one rear. This is the front one below the manifold. Is it normal for the fault to show please?

I didn't think the heater was needed for the front O2 sensor, only the rear which takes longer to warm up.


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T

Functioning heaters for both o2 sensors are expected.

Tim.

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H

Tim.. wrote on 04/01/2014 :

He has just had another fault show up from a cool start - a fuel trim fault. Might that be attributable to the lack of the O2 heater?

The sensor was replaced yesterday by the garage, so I guess it goes back to the garage to see why its not working, thanks.

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M

I had a similar problem on a Toyota, I rewired the heater circuit through a suitable large resistor and the problem went away. AFAICS the heater circuit improves emissions by a tiny bit in the first few minutes of running. The ecu expects to see an appropriate voltage drop on the heater circuit and flags a fault code if the drop is not found.

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M

fuel trim faults are often caused by inlet or exhaust leaks and sometimes by a dodgy maf sensor.

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