P0135 – O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
Encountering the P0135 code in your Haval? Here is a complete guide to its causes, symptoms, and solutions.
What Does Code P0135 Mean
The P0135 code indicates a malfunction in the oxygen sensor heater circuit of Bank 1 Sensor 1. The oxygen sensor is responsible for monitoring the exhaust gas mixture and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture. The heater circuit is used to warm up the oxygen sensor to its optimal operating temperature. When the ECM detects a malfunction in the heater circuit, it triggers the P0135 code.
Common Haval Models Affected
- Haval H6
- Haval H9
- Haval F7
- Haval Jolion
- Haval Big Dog
Symptoms
- Check Engine Light illumination
- Poor engine performance
- Decreased fuel efficiency
- Difficulty starting the engine
- Rough idling
- Failed emissions test
- Reduced engine power
Causes Table
| Potential Cause | Probability (High/Medium/Low) |
|---|---|
| Malfunctioning oxygen sensor | High |
| Corroded or damaged wiring | Medium |
| Faulty heater circuit | High |
| ECM software issue | Low |
| Failed fuse or relay | Medium |
| Intake air leaks | Low |
Diagnostic Steps
To diagnose the P0135 code, start by checking the oxygen sensor and its wiring for any signs of damage or corrosion. Use a multimeter to measure the voltage and resistance of the heater circuit. Monitor the oxygen sensor readings using a scan tool, which should change smoothly depending on engine RPM. Check the fuse and relay for the oxygen sensor heater circuit to ensure they are functioning properly.
How to Fix
The primary repair method for the P0135 code is to replace the oxygen sensor. If the problem is due to corroded or damaged wiring, repair or replace the wiring as needed. In some cases, the heater circuit may need to be repaired or replaced. It is essential to follow proper repair procedures to avoid damaging other components.
Is It Safe to Drive with This Code
Driving with the P0135 code can lead to decreased fuel efficiency, poor engine performance, and potentially cause damage to the catalytic converter. It is recommended to address the issue promptly to avoid further damage to the engine and other components.
Estimated Repair Cost
The estimated repair cost for the P0135 code can range from $200 to $1,000, depending on the specific cause of the problem and the cost of replacement parts.
Preventive Maintenance Tips
To prevent the P0135 code, it is essential to follow regular maintenance schedules, including spark plug replacement, fuel injector cleaning, and oxygen sensor replacement. Regularly inspecting the oxygen sensor and its wiring can help identify potential issues before they become major problems.
Related Trouble Codes
- Error P0133 on Haval — Faulty oxygen sensor circuit
- Error P0134 on Haval — Oxygen sensor circuit intermittent malfunction
- Error P0155 on Haval — Oxygen sensor heater circuit malfunction (Bank 2 Sensor 1)
- Error P0141 on Haval — Oxygen sensor heater circuit malfunction (Bank 1 Sensor 2)