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Home/Cars/Volkswagen/Golf/MK7.5 (2020-Present)/my Volkswagen Golf MK7.5 (2020-Present) is showing a P0135 code how to fix it

my Volkswagen Golf MK7.5 (2020-Present) is showing a P0135 code how to fix it

Volkswagen Golf MK7.5 (2020-Present)

Severity: mediumDifficulty: mediumError Code: P01351-2 hours
3 min read
449 words

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issues in Volkswagen Golf MK7.5. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0135
Component
Exhaust System
Repair Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow engine to cool before opening any components related to the exhaust system.

Symptoms

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

Diagnostic Steps

  1. 1Use an OBD-II scanner to confirm the P0135 code and check for any additional codes.
  2. 2Inspect the wiring and connectors of the upstream oxygen sensor for any visible damage or corrosion.
  3. 3Measure the resistance of the oxygen sensor heater circuit using a multimeter.
  4. 4Verify the voltage and ground supply to the oxygen sensor heater circuit while the engine is running.
  5. 5Check the fuse related to the oxygen sensor heater circuit for continuity.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Allow the engine to cool down before working on the exhaust system.

2. Inspect and Repair Wiring

  • Tools Required: Multimeter, wire cutter/stripper, electrical tape
  • Inspect the wiring harness connected to the upstream oxygen sensor for any damage or wear.
  • Repair or replace any damaged wires or connectors.
  • Ensure that all connections are secure and insulated with electrical tape.

3. Replace Oxygen Sensor

  • Parts Required: New upstream oxygen sensor
  • Tools Required: O2 sensor socket, wrench set, torque wrench
  • Locate the upstream oxygen sensor on the exhaust manifold.
  • Using the O2 sensor socket, carefully remove the old oxygen sensor.
  • Apply anti-seize compound to the threads of the new sensor.
  • Install the new oxygen sensor, tightening it to the manufacturer's specified torque (usually around 30 lb-ft).

4. Reconnect Battery and Clear Codes

  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0135 code and any other related codes.

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
  • Multimeter
  • O2 sensor socket
  • Wrench set
  • Torque wrench
  • Wire cutter/stripper

Parts Required

  • New upstream oxygen sensor

Additional Information

Error CodeP0135
Component

Exhaust System

Repair Time

1-2 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

1 items

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