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Oxygen sensor bias 


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 Post subject: Oxygen sensor bias
Posted: Fri Oct 13, 2006 7:22 pm 
Oompa Loompa

Posts: 39

Joined: 27th Jul 2006

Ride: Falcon

Location: melbourne
VIC, Australia

When engine running cold ie. warming up, the oxy. sensor has a lean biased reading but when running hot it has a rich biased reading. Should i change the oxy. sensor or could it be something else, thanks.
Posted: Fri Oct 13, 2006 8:42 pm 
Getting Side Ways
User avatar

Age: 30

Posts: 3737

Joined: 22nd May 2006

Ride: BF F6 Tornado - #0077

Location: Bendigo
VIC, Australia

should be rich when its cold and about right when its hot. its becuase its in open loop mode while its cold and doesn't use the oxy. i'd say its a fuel supply problem when its cold and when its hot the oxy is over compensating.

but thats hard to say. could be both



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Posted: Fri Oct 13, 2006 10:20 pm 
Parts Gopher

Posts: 76

Joined: 1st Oct 2005

Location: Cairns
QLD, Australia

Until the engine is seen to be at operating temperature at the temp control switch by the ecu the O2 sensor is still deemed to be in warmup mode. If the problem is the tcs after you replace it remeber to reset your ecu so it goes back to a known factory value.
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