how to fix P0135 oxygen sensor code in Ram 1500 DT (2019-Present)

Ram 1500 DT (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0135

3 min read

556 words

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor code in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0135

Affected Component

Exhaust System

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the exhaust system to cool before handling components.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Rough idle
•Engine stalling
•Increased emissions
•Failed emissions test

Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to confirm the P0135 code and check for any additional codes.
2
Inspect the wiring and connectors related to the upstream oxygen sensor for damage, corrosion, or loose connections.
3
Measure the voltage of the oxygen sensor heater circuit using a multimeter to determine if it is within the specified range.
4
Check the vehicle's fuse box for any blown fuses that could affect the oxygen sensor heater circuit.
5
Test the resistance of the oxygen sensor itself with a multimeter to ensure it falls within the manufacturer's specifications.
6
Verify the vehicle's battery voltage, as low voltage may affect sensor operation.

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
•Multimeter
•Oxygen sensor socket
•Torque wrench
•Wire cutters
•Soldering iron

Parts Required

•Upstream oxygen sensor
•Anti-seize compound

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Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to confirm the P0135 code and check for any additional codes.
2
Inspect the wiring and connectors related to the upstream oxygen sensor for damage, corrosion, or loose connections.
3
Measure the voltage of the oxygen sensor heater circuit using a multimeter to determine if it is within the specified range.
4
Check the vehicle's fuse box for any blown fuses that could affect the oxygen sensor heater circuit.
5
Test the resistance of the oxygen sensor itself with a multimeter to ensure it falls within the manufacturer's specifications.
6
Verify the vehicle's battery voltage, as low voltage may affect sensor operation.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle's battery (negative terminal).
Ensure the vehicle is parked on a level surface and engage the parking brake.

2. Inspect and Repair Wiring

Sub-steps:
- Remove the plastic cover or insulation around the wiring harness leading to the oxygen sensor.
- Visually inspect for any frayed wires, corrosion, or damaged connectors.
- Repair or replace any damaged wiring or connectors as necessary.
Tools Required: Wire cutters, soldering iron, heat shrink tubing, electrical tape.

3. Replace the Oxygen Sensor

Sub-steps:
- Locate the upstream oxygen sensor (usually before the catalytic converter).
- Use an oxygen sensor socket or wrench to unscrew the old sensor from the exhaust manifold.
- Apply anti-seize compound to the threads of the new sensor.
- Install the new oxygen sensor and torque it to the manufacturer's specifications (typically around 30 lb-ft).
- Reconnect the electrical connector to the oxygen sensor.
Tools Required: Oxygen sensor socket, torque wrench, anti-seize compound.

4. Reconnect Battery and Clear Codes

Sub-steps:
- Reconnect the negative terminal of the battery.
- Use the OBD-II scanner to clear the P0135 code from the vehicle's computer.
- Start the engine and allow it to reach operating temperature while monitoring the engine performance.
Tools Required: OBD-II scanner.