Codes This Page Will Cover
- P0135 O2 Sensor Heater Circuit – Bank 1 Sensor 1
- P0141 O2 Sensor Heater Circuit – Bank 1 Sensor 2
- P0147 O2 Sensor Heater Circuit – Bank 1 Sensor 3
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What Is the P0135 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help
A P0135 error code is a variation of OBD II code P0. All P0 codes are generic regarding all makes and models and are always displayed as P0XXX. The third numeral in the code sequence identifies where a vehicle’s OBD II system has encountered an error. The number 1 indicates a problem with a vehicle’s fuel and air metering. As it relates to error code P0135, a malfunction regarding the vehicle’s O2 sensor heater circuit has been detected.
More About Error Code P0135
Error code P0135 is the OBD-II generic code indicating the engine control module (ECM) has tested the O2 sensor heater circuit and has detected a problem with the O2 sensor heater circuit in bank 1 sensor 1.
What Are the Symptoms of a P0135 Code?
There are a few symptoms to be aware of as it pertains to error code P0135. The most common symptom of a P0135 error code is the illumination of the vehicle’s check engine light. This notifies the driver that the OBD II system has detected a problem and that repairs are required. Another symptom regarding this error code is that the vehicle’s ECM will not have any O2 sensor feedback until the O2 sensor gives an input. One of the most noticeable symptoms occurs while driving. When operating your vehicle, you may notice that your engine is running rough until the exhaust becomes hot enough to activate the O2 sensor to start giving an output voltage. Rough idling and running are very common regarding this error code.
What Are Some Causes of a P0135 Code?
There are only two known causes that contribute to the display of a P0135 error code. The first and most common cause is the detection of a short or open circuit, or an excessive current draw in the heater circuit detected by the ECM. This code will also appear as the ECM tests for excessive current draw or opens/shorts in the O2 heater circuit when the car starts.
How Serious Is the P0135 Code?
The O2 sensor heater circuit is used to heat the internal parts of the O2 sensor to help it provide feedback to the ECM. If the heater fails, the O2 sensor may still give feedback to the ECM but this process will take more than the standard time of less than two minutes. This can result in an engine stalling or running inadequately, increased fuel consumption, and the accumulation of carbon.
Can I Still Drive with a P0135 Code?
A P0135 error code may cause certain inconveniences including poor fuel economy, engine stalling, and the accumulation of carbon. Short distance drives may not result in any mechanical issues, however, it is recommended to seek repairs from a mechanic before operating the vehicle at all.
How Easy Is It to Diagnose a P0135 Code?
P0135 error codes pertain to some of the most advanced and intricate parts of your vehicle. Common mistakes include neglecting to inspect the O2 wire harness for water entry into the harness cover, not checking the O2 sensor for oil or other contaminants and forgetting to scan the new O2 sensor to make sure the heater circuit works. The most common mistake individuals will make is replacing parts before conducting thorough pinpoint tests and visual checks. In some cases, the driver circuit for the O2 heater may even be damaged. The driver of the O2 heater is normally located within the vehicle’s ECM. It is best to rely on a professional mechanic with experience who can provide a sufficient and accurate diagnosis.
How Difficult Is It to Inspect a P0135 Code?
Repairing a P0135 error code starts with a thorough inspection of the O2 sensor and heater circuit of your vehicle before replacing any sensors, fuses, or wiring. It is best to seek an expert mechanic for repairs as a DIY approach may result in more harm than good, and more money out of your pocket. Diagnosis and repairs must be done by a professional mechanic.
Need Additional Help with Your P0135 Code?
If you need assistance regarding a P0135 error code, you should take your car to a reliable service center in your area for repairs. A mechanic will be able to tell you exactly what is going on with your car and fix the issue promptly. To find a service center in your area, visit the service center list at KBB.com.
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