Help! SES light - rear O-2 sensors and lean
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From: Kihei, HI (most of the time)
Help! SES light - rear O-2 sensors and lean
On a 1999L, the SES light keeps coming on indicating rear o-2 sensor failure. So I put new ones in and they read properly for a while - but then the light comes on again. I'm guessing there is some connector propblem here which is causing the circuit to fail momentarily. Anybody got a clue where I should start? The truck is bone stock, as delivered. Lots of miles, but no chip and no mods. I'm getting tired of re-setting the light. The failure occurs when the truck is warm, not cold.
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Joined: Oct 2002
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From: Bridgeport, MI
Originally Posted by kerno
On a 1999L, the SES light keeps coming on indicating rear o-2 sensor failure. So I put new ones in and they read properly for a while - but then the light comes on again. I'm guessing there is some connector propblem here which is causing the circuit to fail momentarily. Anybody got a clue where I should start? The truck is bone stock, as delivered. Lots of miles, but no chip and no mods. I'm getting tired of re-setting the light. The failure occurs when the truck is warm, not cold.
Kerno, long time Amigo!
Check the wires to the 02's and make sure they are not touching the exhaust and shorting out.
Maybe I-menace will chime in he has had a lot of first hand issues with 02's. I think thats all behind him now!
God Bless,
Suavy
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From: Kihei, HI (most of the time)
Hey Suavy, thanks for the reply. The first thing I did was check the wiring to make sure it was routed properly and not shorted. Everything looks OK. There has got to be a fuse that powers the heaters on the rear O-2' since they are a four wire type. It may be a corroded fuse.
Kern
Kern
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From: Bridgeport, MI
Originally Posted by kerno
Hey Suavy, thanks for the reply. The first thing I did was check the wiring to make sure it was routed properly and not shorted. Everything looks OK. There has got to be a fuse that powers the heaters on the rear O-2' since they are a four wire type. It may be a corroded fuse.
Kern
Kern
Let us know?
Peace,
Suavy