OBD Guide
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P1279

Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response

P1279 is an OBD-II diagnostic trouble code meaning: Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response. Common causes: air-fuel ratio sensor malfunction, damaged or corroded wiring. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Increased fuel consumption
  • Unstable engine idling
  • Reduced engine power
  • Check Engine light comes on
  • Increased emissions of harmful substances

Causes

  • Air-fuel ratio sensor malfunction
  • Damaged or corroded wiring
  • Bad contacts in connectors
  • Problems with power or grounding of the sensor
  • Malfunction of the engine control unit (rare)

How to Fix

  1. Check the condition of the sensor and its connectors
  2. Check the integrity of wiring and contacts
  3. Check the supply voltage and grounding of the sensor
  4. Replace the air-fuel ratio sensor if necessary
  5. Check and, if necessary, update the ECU software

Related codes

P1278P1280P1281

Error P1279 by Vehicle Brand

AcuraHondaInfinitiMazda

FAQ

What does the P1279 code mean?

P1279 is an OBD-II diagnostic trouble code that indicates: Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response

What causes a P1279 error code?

The most common causes of P1279 include: Air-fuel ratio sensor malfunction; Damaged or corroded wiring; Bad contacts in connectors; Problems with power or grounding of the sensor.

How do I fix a P1279 diagnostic trouble code?

To fix P1279: Check the condition of the sensor and its connectors. Check the integrity of wiring and contacts. Check the supply voltage and grounding of the sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1279?

Yes, but get it checked soon

How much does it cost to fix P1279?

The estimated repair cost for P1279 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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