P0141: O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0141 means the heater circuit for the rear oxygen sensor on Bank 1 is not working correctly, so the sensor may take too long to reach operating temperature. The usual fix is replacing the sensor or repairing the heater wiring, with typical independent-shop costs of about $150 to $350.
- Severity
- Moderate
- Can I drive?
- Drive with caution
- DIY?
- Possible with some experience
- Repair cost range
- $90 – $1,200
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What does P0141 mean?
The oxygen sensor after the catalytic converter helps the engine computer check exhaust efficiency and fine-tune fuel control in some conditions. That rear sensor has a small heater inside it so it warms up quickly after a cold start. If the heater circuit fails, the sensor may read late or not at all, which can turn on the check engine light. This code usually points to an electrical problem in the sensor circuit, not a fuel or engine mechanical problem.
Common symptoms
- Check engine light on
- No obvious drivability change
- Slightly worse fuel economy
- Failed emissions test
- Code may return after a cold start
Causes, fixes and costs
P0141: O2 Sensor Heater Circuit (Bank 1 Sensor 2)
General guide for most cars. Your car may differ.
The car will often still drive normally, but the engine computer may stay in a less accurate fuel-control mode and the car may not pass an emissions test. If the engine runs rough, stalls, or the check engine light flashes, stop driving and diagnose it right away.
Most likely causes
- 1
Bad Bank 1 Sensor 2 oxygen sensorHigh
If the code comes back right after clearing it, especially after a cold start, the heater inside the sensor is often open or shorted. This is more likely if the sensor is old or the vehicle has high miles.
Quick check: Inspect the sensor connector and wiring first, then test heater resistance with a multimeter or replace the sensor if the heater circuit tests bad.
- 2
Blown fuse or relay for the O2 sensor heater circuitMedium
If more than one heater-related code is present or the code appears suddenly, the circuit may have lost power from a fuse or relay. This is common when the heater wire shorts and pops the fuse.
Quick check: Check the related fuse and any heater power supply fuse with a test light or meter; replace only after finding the cause of the blown fuse.
- 3
Damaged wiring or connector near the exhaustMedium
If the code shows up after exhaust work, road damage, or rodent damage, the harness may be melted, rubbed through, or corroded. The rear sensor wiring runs close to hot exhaust parts and is easy to damage.
Quick check: Look for melted insulation, broken wires, loose pins, or corrosion at the sensor plug and along the harness.
- 4
ECM driver problemLow
If the sensor and wiring test good and power and ground are present, the control side of the circuit may not be switching correctly. This is less common than a failed sensor or wiring issue.
Quick check: Use wiring diagrams and a scan tool or lab test to verify command and power before suspecting the engine computer.
Can you fix it yourself?
Possible with some experience
Difficulty: Moderate. A careful DIYer can inspect the connector, fuses, and visible wiring, and sometimes replace the rear O2 sensor with basic hand tools. You may need a scan tool and multimeter to confirm the heater circuit before buying parts.
Show the stepsHide the steps
- Check for related codes and clear them
- Inspect the Bank 1 Sensor 2 connector and harness for heat damage
- Check the heater fuse and power supply
- Measure heater resistance or compare to the service spec
- Repair damaged wiring or replace the sensor if the heater is faulty
- Clear the code and perform a cold-start drive cycle
- Recheck for returning codes
Estimated repair cost
$150 – $350
Replace Bank 1 Sensor 2 oxygen sensor: parts ~$50-$180, labor ~$100-$170
- Repair O2 sensor wiring or connector$120 – $300
- Replace blown fuse and diagnose short$90 – $220
- Replace engine computer driver repair not usually serviced separately$500 – $1,200
Prices vary by vehicle, parts quality, rust, and how hard the rear sensor is to reach.
Frequently asked questions
Can I drive with P0141?
Usually yes for a short time, because the car often still runs normally. Get it checked soon, especially if the check engine light stays on before an emissions test.
Will P0141 cause bad gas mileage?
It can, but usually only slightly. The most common effect is an emissions fault and a check engine light, not a major drivability problem.
Do I need to replace the oxygen sensor?
Not always. A blown fuse, bad connector, or damaged wiring can set the same code, so the circuit should be checked before replacing parts.
Can a bad catalytic converter cause P0141?
No, this code is for the rear O2 sensor heater circuit, not catalyst efficiency. A catalytic converter problem is more likely to set codes like P0420 or P0430.
Will P0141 fail inspection?
Yes in many states, because the check engine light is on and the readiness monitors may not complete. The code usually has to be fixed and cleared before the car can pass.
Related codes
- P0135 O2 Sensor Heater Circuit (Bank 1 Sensor 1)
Related problems
This guide covers most cars and is general advice, not an inspection. Prices are typical US independent-shop ranges and vary by region, car and shop. If your brakes, steering or a warning light feel unsafe, stop driving and contact a mechanic.