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Engine-Codes – Volkswagen – P1138 Volkswagen

P1138 Volkswagen Code - Long Term Fuel Trim Add. Fuel B2 System Too Lean

Quick Answer

The P1138 code for Volkswagen vehicles refers to the Long Term Fuel Trim Add. Common causes include Intake air leak, Faulty oxygen sensor, Clogged fuel filter. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1138 Volkswagen indicates Long Term Fuel Trim Add. Fuel B2 System Too Lean.
Common causes
Common causes include Intake air leak, Faulty oxygen sensor, Clogged fuel filter.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1138 Volkswagen Description

The P1138 code for Volkswagen vehicles refers to the Long Term Fuel Trim Add. Fuel B2 System Too Lean. This code indicates that the engine control module (ECM) has detected a lean condition in the long term fuel trim for Bank 2 of the engine. The long term fuel trim is a parameter that the ECM uses to adjust the air-fuel mixture to ensure optimal combustion. When the system is too lean, it means that there is not enough fuel being delivered to the engine for combustion.

OBDII Code P1138 Volkswagen - Long Term Fuel Trim Add. Fuel B2 System Too Lean
P1138 Volkswagen Code - Long Term Fuel Trim Add. Fuel B2 System Too Lean

Common Causes of P1138 Volkswagen

  1. Intake air leak
  2. Faulty oxygen sensor
  3. Clogged fuel filter
  4. Vacuum leak
  5. Malfunctioning fuel injector

Symptoms of P1138 Volkswagen

  1. Rough idle or stalling
  2. Reduced acceleration or power
  3. Engine misfires
  4. Poor fuel economy
  5. Check Engine Light illuminated

How to Fix P1138 Volkswagen

  1. Perform a visual inspection of the intake system to check for any signs of leaks or damage.
  2. Test the oxygen sensor to ensure it is functioning correctly.
  3. Replace the fuel filter if it is clogged or dirty.
  4. Check for vacuum leaks and repair or replace any damaged hoses.
  5. Test the fuel injectors for proper operation and replace any faulty injectors.

Cost to Fix P1138 Volkswagen

The cost of repairing a P1138 code can vary depending on the specific cause of the lean condition. In general, the cost of parts for this repair can range from $100 to $500, depending on the components that need to be replaced. Labor costs can also vary, with hourly rates typically between $80 and $150 per hour. Overall, the total cost of repairing a P1138 code can range from $200 to $1000, depending on the extent of the repairs needed. It is advisable to consult with a qualified mechanic to get a more accurate estimate based on your specific vehicle and location.

What does this mean?

Tech Notes for P1138 Volkswagen

2002 Volkswagen Passat











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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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