OBD Guide
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P1274

Air Fuel Ratio Sensor 1 Bank 1 Rich Shift Monitoring

P1274 is an OBD-II diagnostic trouble code meaning: Air Fuel Ratio Sensor 1 Bank 1 Rich Shift Monitoring . Common causes: air-fuel ratio sensor malfunction, fuel leaking from injectors. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Increased fuel consumption
  • Reduced engine power
  • Black smoke from the exhaust pipe
  • Unstable engine idling
  • Smell of gasoline from the exhaust pipe

Causes

  • Air-fuel ratio sensor malfunction
  • Fuel leaking from injectors
  • Increased pressure in the fuel rail
  • Malfunction of the mass air flow sensor (MAF)
  • Dirty or faulty oxygen sensor

How to Fix

  1. Check AFR sensor readings using a scanner
  2. Inspect fuel injectors for leaks
  3. Check the pressure in the fuel system
  4. Check the condition and readings of the mass air flow sensor
  5. Check the operation of the oxygen sensor

Related codes

P1275P0172P0175

Error P1274 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCLincolnMercuryOldsmobileSaturn

FAQ

What does the P1274 code mean?

P1274 is an OBD-II diagnostic trouble code that indicates: Air Fuel Ratio Sensor 1 Bank 1 Rich Shift Monitoring

What causes a P1274 error code?

The most common causes of P1274 include: Air-fuel ratio sensor malfunction; Fuel leaking from injectors; Increased pressure in the fuel rail; Malfunction of the mass air flow sensor (MAF).

How do I fix a P1274 diagnostic trouble code?

To fix P1274: Check AFR sensor readings using a scanner. Inspect fuel injectors for leaks. Check the pressure in the fuel system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1274?

Limited driving only, diagnose soon

How much does it cost to fix P1274?

The estimated repair cost for P1274 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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