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O2 sensor readings?


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Hi all,

 

I'm pretty sure I have a dead O2 sensor but not quite sure whether they're both shot. Using datascan, RHS reads 0.30 - 0.32 and hardly changes, LHS drops progressively as the engine warms up (!?), starts at around 0.33 and after 5 minutes or so is reading 0.06 - 0.10, occasionally goes up a bit by blipping the throttle.

 

Are either of these exhibiting normal behaviour?? Out of interest these are Bosch sensors and have a different sized hex to the standard NGK ones.

 

Cheers

 

RobH

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Hi all,

 

I'm pretty sure I have a dead O2 sensor but not quite sure whether they're both shot. Using datascan, RHS reads 0.30 - 0.32 and hardly changes, LHS drops progressively as the engine warms up (!?), starts at around 0.33 and after 5 minutes or so is reading 0.06 - 0.10, occasionally goes up a bit by blipping the throttle.

 

Are either of these exhibiting normal behaviour?? Out of interest these are Bosch sensors and have a different sized hex to the standard NGK ones.

 

Cheers

 

RobH

 

 

I had this problem, the one that drops off is dead the other reading is fine for the RHS. If you hold the revs at 2500-3000 the O2 sensor readings should go up an down constantly by quite a wide margin.

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OK I'm pretty sure 0.3 or thereabouts is a duff sensor - unplugging from the loom gives this reading on both sides.

 

I've got a spare pair anyway, I'll bung 'em in and see what happens, was hoping to avoid doing this now the engine is back in, looks a bit of a nightmare :-(

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