P1151 Fault Code – Lack Of HO2S21 Switch - Sensor Indicates Lean

Car Codes diagnostic trouble code

P1151Diagnostic priority

Lack Of HO2S21 Switch - Sensor Indicates LeanDiagnostic contextPotentially applicable to OBD-II-compliant vehicles; confirm against vehicle VIN, model year and module.Vehicle applicabilityApplicability varies by vehicle, powertrain, model year and control module.

Code interpretation

What P1151 means

This code indicates Lack Of HO2S21 Switch - Sensor Indicates Lean Its precise meaning depends on the reporting control module, complete failure-type suffix, model year, powertrain and software level.

Driver experience

Symptoms you may notice

A stored diagnostic trouble code or related system symptom.

Test, do not guess

Possible causes

Confirm the reporting module, circuit condition, power supply, wiring, component performance and software status.

Evidence-led checks

Recommended diagnostic route

Save the complete scan, confirm the full code and reporting module, then test using model-specific multi-brand technical information.

Capture the evidenceSave the complete all-module scan, code suffixes and freeze-frame data.
Prove the basicsTest battery condition, system voltage, power and grounds.
Identify the reporterConfirm the module that logged the code and check circuit integrity.
Compare live dataReview commanded and actual values under the conditions that set the code.
Test before replacingUse model-specific wiring diagrams, pin tests and technical information.
Verify the repairClear the code only after recording evidence, then confirm it does not return.

Vehicle fitment

Vehicle applicability

Ford Ranger, Ford Explorer, Hyundai Santa Fe, Toyota Prius Plug-in

Before clearing

Can the code be cleared?

Clearing a code without fixing the cause removes useful evidence and may only switch the warning off temporarily. Save the full scan first; a permanent or repeatedly returning code needs testing.

A DTC is evidence, not a parts order.

Confirm the suffix, reporting module, model, year, engine and live data before replacing a component.

Verified public evidence

Manufacturer and model coverage

14 public manufacturer records match this search. These records support applicability research but do not replace VIN-specific workshop information.

P1151Ford Explorer
EXPLORER · 1996 · Powertrain

SOME VEHICLE MAY EXHIBIT MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH DIAGNOSTIC TROUBLE CODES (DTCS) PO171, PO174, P1131 AND / OR P1151 STORED IN MEMORY. *TT

Source

P1151Ford Explorer
EXPLORER · 1997 · Powertrain

SOME VEHICLE MAY EXHIBIT MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH DIAGNOSTIC TROUBLE CODES (DTCS) PO171, PO174, P1131 AND / OR P1151 STORED IN MEMORY. *TT

Source

P1151Ford Explorer
EXPLORER · 1998 · Powertrain

SOME VEHICLE MAY EXHIBIT MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH DIAGNOSTIC TROUBLE CODES (DTCS) PO171, PO174, P1131 AND / OR P1151 STORED IN MEMORY. *TT

Source

P1151Ford Explorer
EXPLORER · 1996 · Powertrain

THE MALFUNCTION INDICATOR LAMP (MIL) MAY ILLUMINATE AND DIAGNOSTIC TROUBLE CODES (DTCS) P0171, P0174, P1131, AND / OR P1151 MAY BE PRESENT WITH OR WITHOUT MISFIRE, ROLLING IDLE, ROUGH IDLE,…

Source

P1151Ford Explorer
EXPLORER · 1997 · Powertrain

THE MALFUNCTION INDICATOR LAMP (MIL) MAY ILLUMINATE AND DIAGNOSTIC TROUBLE CODES (DTCS) P0171, P0174, P1131, AND / OR P1151 MAY BE PRESENT WITH OR WITHOUT MISFIRE, ROLLING IDLE, ROUGH IDLE,…

Source

P1151Ford Explorer
EXPLORER · 1998 · Powertrain

THE MALFUNCTION INDICATOR LAMP (MIL) MAY ILLUMINATE AND DIAGNOSTIC TROUBLE CODES (DTCS) P0171, P0174, P1131, AND / OR P1151 MAY BE PRESENT WITH OR WITHOUT MISFIRE, ROLLING IDLE, ROUGH IDLE,…

Source

P1151Ford Ranger
RANGER · 1997 · Powertrain

A ROUGH IDLE, STALLING AT AN IDLE AND/OR DIAGNOSTIC TROUBLE CODES (DTCS) P0171, P0174, AND/OR P1151 MAY BE STORED IN MEMORY ON SOME VEHICLES WITH A 4.OL ENGINE. *YC

Source

P1151Hyundai Santa Fe
SANTA FE · 2001 · Powertrain

P1151 (ACCELERATOR POSITION SENSOR -- ECM). *TT

Source

P1151Hyundai Santa Fe
SANTA FE · 2002 · Powertrain

P1151 (ACCELERATOR POSITION SENSOR -- ECM). *TT

Source

P1151Hyundai Santa Fe
SANTA FE · 2003 · Powertrain

P1151 (ACCELERATOR POSITION SENSOR -- ECM). *TT

Source

P1151Hyundai Santa Fe
SANTA FE · 2004 · Powertrain

P1151 (ACCELERATOR POSITION SENSOR -- ECM). *TT