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Old 11-25-2007, 09:15 PM
Join Date: Jul 2006
Location: Sacramento, California
Posts: 107
fault code help 1988 300 sel m103

I've done my diligent searching, and I'm still confused. My CEL came on a few days ago. I am getting fault code 5. I am unsure what this code means. In looking thru the forum it seems it is either the O2 sensor or the EGR. Also, is the O2 sensor under the front passenger carpet? Any help would be appreciated.

Eric Zacharias

'88 300 SEL
'64 Ford Falcon
'99 Infiniti QX4
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Old 11-25-2007, 09:39 PM
Registered User
Join Date: Aug 2003
Location: Phoenix
Posts: 3,726
Code 5 would be for O2 sensor. It is located in the exhaust pipe just behind the engine. Follow the wire to the connection, which may be under the front passenger carpet.

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