OBD Guide
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P1131

Lack Of HO2S Switch - Sensor Indicates Lean

P1131 is an OBD-II diagnostic trouble code meaning: Lack Of HO2S Switch - Sensor Indicates Lean. Common causes: oxygen sensor malfunction, air leaks in the intake tract. Estimated repair cost: $17–61.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–61 (est.)

Symptoms

  • Increased fuel consumption
  • Unstable engine idling
  • Power Loss
  • Check Engine light comes on

Causes

  • Oxygen sensor malfunction
  • Air leaks in the intake tract
  • Problems with the fuel pump or injectors
  • DMRV malfunction
  • Damage to sensor wiring

How to Fix

  1. Check the tightness of the intake tract
  2. Check the operation of the fuel system
  3. Check the condition of the oxygen sensor and its wiring
  4. Replace a faulty oxygen sensor
  5. Reset the error code and check if it returns

Related codes

P1130P1132P1129

Error P1131 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCLincolnMazdaMercuryOldsmobileSaturnSubaruVolkswagen

FAQ

What does the P1131 code mean?

P1131 is an OBD-II diagnostic trouble code that indicates: Lack Of HO2S Switch - Sensor Indicates Lean

What causes a P1131 error code?

The most common causes of P1131 include: Oxygen sensor malfunction; Air leaks in the intake tract; Problems with the fuel pump or injectors; DMRV malfunction.

How do I fix a P1131 diagnostic trouble code?

To fix P1131: Check the tightness of the intake tract. Check the operation of the fuel system. Check the condition of the oxygen sensor and its wiring. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1131?

Yes, but get it checked soon

How much does it cost to fix P1131?

The estimated repair cost for P1131 is $17–61. Actual cost depends on your vehicle, location, and labor rates.

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