Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1131OXYGEN SENSOR LEAN - NOT SWITCHING
Manufacturer communications
11Original wording in English
FORD
MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P1131 AND/OR P1151 - 4.2L ENGINE. *TT
FORD, MERCURY
MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0133, P1131 OR P2195. *TT
FORD, MERCURY
MALFUNCTION INDICATOR LAMP (MIL) ON WITH DIAGNOSTIC TROUBLE CODE (DTC) P0171/P0174, P1131/P1151, AND/OR P2195/P2197 IN CONTINUOUS MEMORY. *TT
MAZDA
SUBJECT REGARDING THE ILLUMINATION OF THE MALFUNCTION INDICATOR LAMP WITH DIAGNOSTIC TROUBLE CODES P1151/P1131 (OXYGEN SENSOR LEAN - NOT SWITCHING) AND/OR P0171/P0174 (AIR FUEL MIXTURE ON LEAN SIDE) STORED IN CONTINOUS MEMORY. *SLC
Check vehicle applicability
34A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ford | E-150 ↗ | 2003 |
| Ford | E-150 ↗ | 2002 |
| Ford | E-150 ↗ | 2001 |
| Ford | E-250 ↗ | 2003 |
| Ford | E-250 ↗ | 2002 |
| Ford | E-250 ↗ | 2001 |
| Ford | EXPLORER ↗ | 1998 |
| Ford | EXPLORER ↗ | 1997 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Lack Of HO2S Switch – Sensor Indicates Lean
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.