What it means
The heating element inside the downstream oxygen sensor on bank 1 is open-circuit, drawing no current, or drawing too much. Without heater, the sensor takes much longer to reach operating temperature, delaying catalyst diagnosis.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 1 Sensor 2 is the oxygen sensor downstream of the catalytic converter, and its built-in heater brings it to operating temperature sooner after a cold start. P0141 sets when the module detects an electrical problem in that heater circuit, such as an open element or current outside the expected range.
Common causes
Most likely first.
- Heater element open-circuit
- Heater fuse blown
Symptoms
- Check engine light on after several drive cycles
- Slightly increased fuel consumption during cold start
- Delayed entry into closed-loop fuel control
- Failed emissions inspection (lambda readiness)
How to diagnose it
- Check freeze-frame and pending codes, and note whether P0141 returns after a cold start when the heater should be active.
- Inspect the Bank 1 Sensor 2 connector and nearby harness for heat damage, corrosion, loose terminals, or a short to the exhaust.
- Check the heater fuse and its power supply, since a blown fuse can disable the downstream sensor heater.
- With the circuit de-energized as specified by the manufacturer, test the sensor heater element and wiring for an open or short.
- If the fuse, wiring, and heater element pass, check heater control at the module using the manufacturer's procedure.
Common fixes
- Repair damaged Bank 1 Sensor 2 heater wiring or connector terminals.
- Replace the blown heater fuse after locating and correcting any short that caused it.
- Replace Bank 1 Sensor 2 if its heater element is open or out of specification.
- Repair a confirmed heater-control circuit fault.
Can I keep driving?
The vehicle will usually remain drivable, but cold-start emissions monitoring and catalyst readiness can be delayed, which may cause an emissions inspection failure. Avoid ignoring the warning for long, especially if other engine symptoms appear.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.