OBD Guide
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P1273

Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

P1273 is an OBD-II diagnostic trouble code meaning: Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring. Common causes: air-fuel ratio sensor malfunction, engine vacuum leak. Estimated repair cost: $33–89.

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

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Increased fuel consumption
  • Unstable engine idling
  • Possible misfires

Causes

  • Air-fuel ratio sensor malfunction
  • Engine vacuum leak
  • Dirty or faulty fuel injectors
  • Problems with the fuel pump or fuel pressure regulator
  • Air filter clogged

How to Fix

  1. Check the air-fuel ratio sensor for damage.
  2. Look for vacuum leaks in the engine
  3. Check the condition of the fuel injectors
  4. Check the fuel pressure in the system
  5. Replace the air filter if necessary

Related codes

P0171P0174P2195

Error P1273 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCLincolnMercuryOldsmobileSaturn

FAQ

What does the P1273 code mean?

P1273 is an OBD-II diagnostic trouble code that indicates: Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

What causes a P1273 error code?

The most common causes of P1273 include: Air-fuel ratio sensor malfunction; Engine vacuum leak; Dirty or faulty fuel injectors; Problems with the fuel pump or fuel pressure regulator.

How do I fix a P1273 diagnostic trouble code?

To fix P1273: Check the air-fuel ratio sensor for damage.. Look for vacuum leaks in the engine. Check the condition of the fuel injectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1273?

Yes, but get it checked soon

How much does it cost to fix P1273?

The estimated repair cost for P1273 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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