AutoCodes – Volkswagen – P1136 Volkswagen

P1136 Volkswagen Code - Long Term Fuel Trim Add. Fuel B1 System Too Lean

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when the ECM is no longer capable of controlling the air-fuel ratio. Common causes include Intake air leak, Faulty O2 Sensor, Faulty Mass Air Flow (MAF) Sensor. 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: P1136 Volkswagen indicates Long Term Fuel Trim Add. Fuel B1 System Too Lean.
Common causes: Common causes include Intake air leak, Faulty O2 Sensor, Faulty Mass Air Flow (MAF) Sensor.
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.

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Code Popularity 39,773

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 11, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
Comments
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Code P1136 Volkswagen Description

This fault code is stored in the Engine Control Module (ECM) when the ECM is no longer capable of controlling the air-fuel ratio. For the correct operation of the catalytic converter, the ECM is required to keep the Air-Fuel Ratio (AFR) at approximately lambda 1; this equates to an AFR of 14.7:1 by mass. This is achieved by trimming the fuel mixture to the required amount to cater for slight anomalies during normal operating conditions. However, when a fault causes the fuel trim to exceed a predetermined level the malfunction indicator light is illuminated and a limited operating strategy is employed. The pre-catalyst exhaust gas oxygen sensor is the primary component used for calculating the fuel trim once the system enters closed-loop control. The fuel trim data can be displayed as a percentage, either positive or negative.
This Diagnostic Trouble Code (DTC) can be caused by a faulty mass airflow sensor, fuel pressure regulator, fuel pump, exhaust or intake leaks, secondary air injection leaks, or vacuum leaks. Additionally, any mechanical faults can cause this DTC as well. Common failure points associated with this code are a damaged EVAP purge regulator valve, brake booster, and hoses, electric vacuum pump (if equipped), PVC or ventilation system.

OBDII Code P1136 Volkswagen - Long Term Fuel Trim Add. Fuel B1 System Too Lean - AutoCodes.com — P1136 Volkswagen Code - Long Term Fuel Trim Add. Fuel B1 System Too Lean

What does this mean?

What are the Possible Causes of the DTC P1136 Volkswagen?

Intake air leak
Faulty O2 Sensor
Faulty Mass Air Flow (MAF) Sensor
O2 Sensor harness is open or shorted
O2 Sensor circuit poor electrical connection

How to Fix the DTC P1136 Volkswagen?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

2002 Volkswagen Passat

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1136 Volkswagen code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.