Problem with O2 sensor and a/f ratio....

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May 16, 2004 | 09:29 PM

#11

taz77

Member

Joined: Aug 2002

Posts: 66

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From: s.f. bay area

Quote:

Originally Posted by sensei

If it was my car, I'd replace the primary O2 sensor. Sounds like the ECU is going into limp mode.

if you're running in limp mode, it'd be running rich, not lean...
if you snap the throttle real quick... does the gauge ever read rich?

May 17, 2004 | 02:55 AM

#12

sensei

Registered User

Joined: Feb 2004

Posts: 193

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From: Michigan

with a bad O2, the gauge will show lean (low voltage signal) in limp mode even though obviously the car is running rich.

May 17, 2004 | 09:43 PM

#13

taz77

Member

Joined: Aug 2002

Posts: 66

Likes: 0

From: s.f. bay area

Quote:

Originally Posted by sensei

with a bad O2, the gauge will show lean (low voltage signal) in limp mode even though obviously the car is running rich.

gotcha...makes sense

May 18, 2004 | 12:43 AM

#14

MrFatbooty

Wannabe yuppie

Joined: Dec 2000

Posts: 25,918

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From: Madison, WI

From my understanding of how the Honda ECU works, it has to be throwing a code to go into limp mode. A bad oxygen sensor doesn't always cause the ECU to throw a code, and if that's the case then the ECU doesn't go into limp mode. Limp mode is a function of the ECU, not of the oxygen sensor itself.