P0141 on Chevrolet: How to Diagnose & Fix
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
2 Chevrolet models · 2 documented issues · $100-$1,600 repair
P0141 on Chevrolet by model: symptoms, diagnosis and fix
Oxygen sensors fail causing poor fuel economy and check engine light. Both upstream and downstream sensors prone to failure. Oil consumption issues accelerate sensor fouling.
Common Symptoms
- Check engine light
- Poor fuel economy
- Rough idle
- Failed emissions test
- Sulfur/rotten egg smell
How to Fix
Replace failed oxygen sensor(s). Use Denso or NTK OEM-quality sensors. Address any oil consumption issue to prevent premature fouling of new sensor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Oxygen SensorCross-ref13051
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (1)
The Cobalt is a repeat offender for P0420 (Catalyst System Efficiency Below Threshold, Bank 1). The Ecotec's two chronic upstream problems — random misfire from failing ignition coils/coil-pack modules, and oil consumption past worn rings and valve seals — poison and overheat the catalyst substrate. Once the converter's oxygen storage is gone the rear O2 sensor mirrors the front sensor and the PCM sets P0420, which fails state emissions inspection. Owners frequently report throwing an aftermarket converter and a set of O2 sensors at the code only to have it return within a few thousand miles, because the underlying misfire or oil burn was never corrected. On direct-fit replacement, the low-grade aftermarket converters that dominate this application often cannot hold the efficiency threshold on a healthy engine either.
Common Symptoms
- Check Engine Light with P0420
- Failed emissions or state inspection
- Rotten-egg sulfur smell from the exhaust
- Sluggish acceleration and reduced fuel economy
- Rattle from under the car (broken substrate)
How to Fix
Do not start by replacing the converter. Scan for and repair any misfire codes (P0300/P030x) first — coils, plugs and the ignition control module are the usual causes on this engine — and check oil consumption over a measured interval. Then verify the rear O2 sensor is actually working by graphing both sensors: a slow or lazy downstream sensor sets P0420 without a bad catalyst, and it is far cheaper. Check for exhaust leaks ahead of the rear sensor, which lean out the reading and mimic catalyst failure. Only after the engine runs clean should you replace the converter, and choose a converter meeting the correct federal or CARB standard for your state or the code will return.
Sources for this issue (3)
P0141 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0141 mean on a Chevrolet?
P0141 stands for "O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)." This code means the Engine Control Module detected a problem in the heater circuit of the oxygen sensor located on Bank 1, Sensor 2 — the downstream O2 sensor after the catalytic converter on the bank containing cylinder 1. This sensor has a built-in heating element that brings it up to operating temperature quickly so it can read exhaust accurately. P0141 sets when the computer sees abnormal current or voltage in that heater circuit (open, shorted, or out of range). It is mainly an emissions/monitoring fault and usually doesn't affect how the car drives. On Chevrolet it is documented across 2 models: Prizm, Cobalt.
What are the most common causes of P0141?
The most common causes of P0141 are: Failed oxygen sensor heater element (internal to the sensor), Blown fuse feeding the O2 sensor heater, Open, shorted, or corroded heater circuit wiring, Corroded or loose O2 sensor connector, Poor ground or power feed to the heater circuit, Exhaust heat damage to the sensor or harness, Faulty ECM/PCM heater driver. The specific cause varies by vehicle.
How much does it cost to fix P0141 on a Chevrolet?
Published repair estimates on Chevrolet range from $100 to $1,600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0141 on a different make?
View P0141 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.