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intermittent P1131

iverger

Be Gentle I'm New Here
Joined
Mar 1, 2007
Messages
3
I have a 98 2.5L V6 149k miles. Over the last few weeks the "check engine" light has been coming on for a few days then clearing itself for a few days. The only code it is showing when I check it at the local autozone is P1131.

A basic search gave me a few places to start. Like cleaning the MAF and checking for vacuum leaks around the intake and/or PCV system (PCV Valve is new). The other possibility is the upper bank 1 O2 sensors.

My question is this; There are MIL Eliminators on the lower to O2 sensors, would that make it more likely to be the MAF or a vacuum leak or is this code more a funtion of the output of the top O2 sensor independant of the reading from the downstream sensor after that cat?

Thanks,
Bob
 
[FONT=arial,verdana,helvetica,sans-serif]P1131[/FONT][FONT=arial,verdana,helvetica,sans-serif]Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1. [/FONT]


time for a new O2 sensor.


this has nothing to do with the downstream sensor or mil-eliminator
 
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