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Home/Cars/Ram/1500/DT (2019-Present)/my Ram 1500 DT (2019-Present) has a check engine light with code P0135

my Ram 1500 DT (2019-Present) has a check engine light with code P0135

Ram 1500 DT (2019-Present)

Error Codes
Severity: mediumDifficulty: mediumError Code: P01351-3 hours
3 min read
498 words

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor heater circuit issues in Ram 1500 DT (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

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

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool completely before removing any components.

Symptoms

  • •Check engine light illuminated
  • •Poor fuel economy
  • •Rough engine idle
  • •Increased emissions
  • •Engine performance issues

Diagnostic Steps

  1. 1Scan the vehicle with an OBD-II scanner to confirm the P0135 code and check for any additional codes.
  2. 2Inspect the wiring and connectors leading to the upstream oxygen sensor for damage, corrosion, or poor connections.
  3. 3Measure the resistance of the oxygen sensor heater circuit using a multimeter to determine if it is within manufacturer specifications.
  4. 4Check the vehicle’s fuse box for any blown fuses related to the oxygen sensor circuit.
  5. 5Test the voltage at the oxygen sensor connector while the engine is running to ensure proper power supply to the sensor heater circuit.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the battery to ensure safety during repair.

2. Inspect and Repair Wiring

  • Step 1: Visually inspect the wiring harness for the upstream oxygen sensor.
  • Step 2: Repair any damaged wires or connectors by soldering or using appropriate connectors.
  • Tools Required: Wire strippers, soldering iron, electrical tape.

3. Replace Upstream Oxygen Sensor

  • Step 1: Remove the old oxygen sensor using an oxygen sensor socket.
  • Step 2: Apply anti-seize compound to the threads of the new oxygen sensor.
  • Step 3: Install the new oxygen sensor and tighten it to manufacturer specifications (usually around 30 lb-ft).
  • Tools Required: Oxygen sensor socket, torque wrench.

4. Reconnect Battery

  • Step 1: Reconnect the battery terminals.
  • Step 2: Ensure the connections are secure and free from corrosion.

5. Clear Codes and Test

  • Step 1: Use the OBD-II scanner to clear the P0135 code from the vehicle’s computer.
  • Step 2: Start the engine and allow it to reach operating temperature while monitoring the scanner for any reoccurrence of the code.

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
  • •Oxygen sensor socket
  • •Torque wrench
  • •Wire strippers
  • •Soldering iron

Parts Required

  • •Upstream oxygen sensor
  • •Anti-seize compound

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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