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 communications
11Original wording in English
MACK
Diagnostic Trouble Codes P029900 Or P226C00 With Possible P115100 - US17+OBD19 Emissions And Newer
VOLVO
Diagnostic Trouble Codes P029900 Or P226C00 With Possible P115100 - US17+OBD19 Emissions And Newer
FORD
MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P1131 AND/OR P1151 - 4.2L ENGINE. *TT
TOYOTA
MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P1151. *TT
Check vehicle applicability
32A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ford | AEROSTAR ↗ | 1997 |
| 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 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Lack Of HO2S21 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.