P0141 on Ford: How to Diagnose & Fix
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
1 Ford model · 1 documented issue · $150-$800 repair
P0141 on Ford by model: symptoms, diagnosis and fix
The Ford EcoSport is known for premature exhaust flex pipe failure, where the flexible coupling between the exhaust manifold and the catalytic converter develops cracks and leaks. The flex pipe deteriorates from thermal cycling and vibration, causing a loud exhaust ticking or hissing noise that is most noticeable at startup and during acceleration. The leak can also trigger oxygen sensor codes and cause the check engine light to illuminate. In areas with road salt, corrosion accelerates the failure.
Common Symptoms
- Ticking or hissing noise from exhaust at cold startup
- Loud exhaust noise during acceleration
- Exhaust smell inside the vehicle cabin
- Check engine light with oxygen sensor or catalyst codes
- Visible crack or corrosion on the flex pipe under the vehicle
How to Fix
Replace the exhaust flex pipe section. An independent muffler shop can weld in a universal flex pipe for $150-$300 total. The dealer approach replaces the entire front exhaust pipe assembly ($400-$800 parts and labor). Aftermarket stainless steel flex pipe sections are available that are more durable than the OEM mild steel component. Do not ignore the leak — exhaust gases can enter the cabin through the HVAC system.
Sources for this issue (1)
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 Ford?
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 Ford it is documented across 1 model: EcoSport.
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 Ford?
Published repair estimates on Ford range from $150 to $800 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.