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#1073579 10/09/04 03:05 PM
Joined: Feb 2004
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fpipes Offline OP
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Please, can someone tell me what p1131 means, and how i can go about fixing it.

98 tour 93,000 ztec atx

#1073580 10/09/04 03:46 PM
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P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.

The sensor is monitered for switching, it fails to switch when circuit or fuel excedes a calibrated limit.

Here the possible causes

- short to VPWR is harness
- Water in harness
- short/open circuit
- corrison or bad wiring
- damaged O2 sensor
- damaged PCM
- excessive fuel pressure
- leaking injectors
- leaking fuel pressure regulator
- car is almost out of fuel
- air leaks after MAF
- vacuum leak
- PCV system
- engine oil dipstick not seated
- EGR valve gasket leaking
- stuck EGR valve
- leaking diaphram or EVR
- oil overfilled
- cam timing is off
- cylinder compression
- exhaust leak near the O2 sensor

hope that helps

#1073581 10/09/04 06:33 PM
Joined: Oct 2002
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On a Zetec the first tactic would be to clean the MAF as there is no real cost involved and it stands a good chance of being the problem.


"Those who cannot remember the past are condemned to repeat it" -George Santayana
#1073582 10/10/04 01:54 AM
Joined: Aug 2003
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I had this code on my Zetec about 3 months ago. All I did was clean the MAF and it's okay now. If you have not changed your air filter in along while, then this can also do the same error code, or cause enough dirty air going past the MAF, making it dirty ect... ect... you get the point.


Moderated by  horseydug_dup1, Ray_dup1 

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