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Thread: z18xe engine

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    Regular Member winnie2457's Avatar
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    Default z18xe engine

    hi all i was helping my friend out with a zafira 2002 1.8 engine with his engine managment light on about a year ago it came on and the garage changed both o2 sensors front and back of the cat the light went out but then came back on again and been on ever since i have now looked at the codes and there is one present all the time i forgot the code number but it says o2 heater circuit out of range i think

    any ideas will it need a new sensor again or not?

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    Regular Member billyyoung's Avatar
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    just had a simliar problem with mine, fuel trim bank malfunction , heated o2 sensor malfunction got to the bottom of it , the maf sensor was not showing the air going through it . try and get it on a computer with live sensor data. that might help it will show you the voltage going to the o2 sensors but it is in milli volts . also check for resistance over the sensor to think the auto data book gives you a figure to check for

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