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Engine-Codes.com | All About OBDII Engine Codes

P1131 Mazda

P1131 Mazda - Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1

P1131 Mazda Comments |  Add Comment
Possible causes
- Vacuum leak affecting bank 1 only
- Fuel injector problem bank 1
- Check for cylinder misfire on bank 1
- Engine mechanical condition
- Faulty O2 sensor.
Help with Possible causes What does this mean?
Tech notes
Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.
Help with Tech Notes What does this mean?
When is the code detected?
The Engine Control Module (ECM) detected bank 1 oxygen (O2) at its lean limit
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
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MAZDA Technical Service Bulletins for P1131 code
1997 MAZDA B4000 Unknown Or Other Details
1998 MAZDA 626 Unknown Or Other Details
1998 MAZDA 626 Unknown Or Other Details
1998 MAZDA 626 Unknown Or Other Details
1999 MAZDA 626 Unknown Or Other Details
More Bulletins Help with Technical Service Bulletins What does this mean?
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