OBD Guide
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P1139

Long Term Fuel Trim Add. Fuel B2 System Too Rich

P1139 is an OBD-II diagnostic trouble code meaning: Long Term Fuel Trim Add. Fuel B2 System Too Rich. Common causes: oxygen sensor malfunction (bank 2), fuel leak in the fuel system. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Increased fuel consumption
  • Black smoke from the exhaust pipe
  • Unstable engine operation
  • Power Loss
  • Gasoline smell from exhaust

Causes

  • Oxygen sensor malfunction (Bank 2)
  • Fuel leak in the fuel system
  • Dirty or faulty injectors
  • Problems with the EVAP system
  • Malfunction of the mass air flow sensor (MAF)

How to Fix

  1. Check oxygen sensor readings
  2. Inspect the fuel system for leaks
  3. Check the condition and operation of the fuel injectors
  4. Diagnose the EVAP system for faults
  5. Check the performance of the mass air flow sensor

Related codes

P1138P1140P0172

Error P1139 by Vehicle Brand

BMWBuickCadillacChevroletChryslerFordGMGMCLincolnMercuryOldsmobileSaturnSubaruVolkswagen

FAQ

What does the P1139 code mean?

P1139 is an OBD-II diagnostic trouble code that indicates: Long Term Fuel Trim Add. Fuel B2 System Too Rich

What causes a P1139 error code?

The most common causes of P1139 include: Oxygen sensor malfunction (Bank 2); Fuel leak in the fuel system; Dirty or faulty injectors; Problems with the EVAP system.

How do I fix a P1139 diagnostic trouble code?

To fix P1139: Check oxygen sensor readings. Inspect the fuel system for leaks. Check the condition and operation of the fuel injectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1139?

Yes, but get it checked soon

How much does it cost to fix P1139?

The estimated repair cost for P1139 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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