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

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.

Hmm...I'm sure I'd read somewhere that approx 0.3 meant it was a dead 'un...

Hmm...I'm sure I'd read somewhere that approx 0.3 meant it was a dead 'un...

 

0.3 is ok, do the test with the revs.

this is quite the opposite of what is posted here

http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=2123769&forum=general&dtSearch=0

 

I'm sure I read elsewhere that 0.3V was dead too...I'll keep looking

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 :-(