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how to fix P0135 code in Volkswagen Golf MK6 (2009-2014) - Volkswagen Golf
Home/Cars/Volkswagen/Golf/MK7 (2015-2019)/how to fix P0135 code in Volkswagen Golf MK6 (2009-2014)

how to fix P0135 code in Volkswagen Golf MK6 (2009-2014)

Volkswagen Golf MK7 (2015-2019)

Error Codes
1-3 hours
Time
medium
Difficulty
medium
Severity
Error Code: P0135
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ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
561 words

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issues in Volkswagen Golf MK6 (2009-2014). Step-by-step guide with tools and procedures.

Error Code
P0135
Affected Component
Exhaust System
Estimated Time
1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical systems.
  • •Allow the engine to cool before working near the exhaust components to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Poor fuel economy
  • •Rough idle
  • •Increased emissions
  • •Engine stalling or hesitation during acceleration

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Oxygen sensor socket
  • •Multimeter
  • •Electrical contact cleaner
  • •Soldering iron
  • •Torque wrench

Parts Required

  • •Upstream oxygen sensor
  • •Fuse

Additional Information

Error Code
P0135
Affected Component
Exhaust System
Estimated Time
1-3 hours
Difficulty
medium
Severity
medium
Tools Required
6 items
Parts Required
2 items

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Solution
1. Preparation
  • Gather necessary tools and parts.
  • Disconnect the negative terminal of the battery to ensure safety while working on the electrical system.
  • Allow the engine to cool down before starting work.
2. Inspect and Repair Wiring

  • Inspect Wiring:

    • Visually check the oxygen sensor wiring harness for fraying or damage.
    • Repair any damaged wires using solder and electrical tape or replace the wiring harness if necessary.

  • Reconnect Connectors:

    • Ensure that all connectors are securely attached. Clean any corrosion with electrical contact cleaner.
3. Replace the Upstream Oxygen Sensor

  • Remove the Old Sensor:

    • Use an oxygen sensor socket to unscrew the old sensor from the exhaust manifold.
    • Disconnect the wiring harness from the old sensor.

  • Install the New Sensor:

    • Apply anti-seize compound to the threads of the new oxygen sensor (if applicable).
    • Screw the new sensor into the exhaust manifold and tighten it to the manufacturer's specifications (typically 30-50 lb-ft).
    • Reconnect the wiring harness to the new sensor.
4. Check and Replace Fuse (if necessary)
  • Inspect Fuse:
    • Locate the fuse box and identify the fuse related to the oxygen sensor heater circuit.
    • Remove the fuse and visually check if it is blown. Replace it with a fuse of the same amperage if necessary.
5. Reconnect Battery and Clear Codes
  • Reconnect the negative terminal of the battery.
  • Use the OBD-II scanner to clear the P0135 code and any other diagnostic trouble codes stored in the vehicle's system.