What does the P0141 OBD-II code mean?
The P0141 code is a generic OBD-II code indicating a malfunction with the O2 bank 1 sensor 2 heater circuit. This is the sensor behind the catalyst on bank 1 of the engine. On startup, the engine control module (ECM) tests the O2 sensor heater circuit, and if a malfunction is detected, the P0141 trouble code is triggered.
How serious is the P0141 code?
The diagnostic code P0141 is considered a moderately serious trouble code, and any extended driving may cause internal engine damage. Whilst it is, therefore, possible to continue driving a vehicle showing a P0141 trouble code, it’s preferable to get the car diagnosed and repaired as soon as possible to avoid expensive additional costs.
What are the common symptoms of a P0141 trouble code?
The most commonly experienced symptoms when a P0141 OBD-II code is triggered are:
- Check engine light illuminates
- Decreased fuel efficiency
- The engine may run rough
- Misfires (rare)
What are the causes of a P0141 diagnostic code?
The most common causes for the P0141 trouble code triggering are:
- Faulty oxygen sensor
- Defective wiring/connections around oxygen sensor
- Open ground or short in the wiring
- Excessive current draw from the oxygen sensor
How to diagnose a P0141 OBD-II code?
The quickest way to diagnose a fault code is to use an OBD-II scanner or book a diagnostic check with a trusted garage or mechanic. Following the diagnostic steps fully and correctly is essential for accurate diagnosis:
- Scan your system for other OBD-II codes. If present, these must be resolved first.
- Clear the fault codes, then follow this with a test drive of the car while reading the live data on an OBD-II scanner.
- Monitor the O2 sensor data to check heater circuit is operational for bank 1 sensor 2
- Visually check the electrical connections and wiring around the oxygen sensor and wiring harness for damage or corrosion.
- Check the power to the O2 sensor heater circuit
- Check for a blown fuse to the heater circuit
- Check the O2 sensor heater circuit for the proper resistance
How to fix a P0141 OBD-II fault code?
After each check/work is performed, it’s recommended to test drive the vehicle to see if the OBD-II code clears. If the fault code returns, move on to the next repair. The most common repairs (in no particular order) to resolve a P0141 are below:
- Confirm the code using an OBD-II scanner, and then reset the trouble code. You should then test drive the car to see if the code returns. If it does return:
- Clean away any corrosion found on the engine ground
- Clean the oxygen sensor, removing any dirt and corrosion around the connections
- Repair or replace wiring or connection to the O2 sensor for bank 1 sensor 2
- Replace the fuse to the heater circuit for the O2 sensor he