Sensors and circuits
P0141
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
What does P0141 mean?
P0141 is the same heater-circuit fault as P0135 but on the downstream oxygen sensor, the one after the catalytic converter on bank 1. That sensor monitors converter efficiency rather than controlling the fuel mixture, so a failed heater here affects emissions monitoring more than it affects driving.
Can I keep driving with P0141?
Low urgency
Safe to drive. Its practical impact is that emissions readiness monitors may not complete, which blocks an inspection pass.
Symptoms of P0141
Check engine light
Failed emissions test, or monitors that will not set to ready
No noticeable change in how the car drives
Common causes of P0141
A failed heater element in the downstream oxygen sensor
A blown fuse shared with the heater circuit
Corroded or damaged wiring near the exhaust
A relay fault on the heater supply
These are ordered roughly by how often they turn out to be the cause — but the code names a system, not a part. Confirming which one is yours takes data from the running engine.
What does it cost to fix P0141?
$150 – $500
Typical US independent-shop range, parts and labour included. It is wide on purpose: the cheap end is usually a sensor, a hose or a cap, and the expensive end is the major component the code was reporting on. Which one you need is a diagnosis, not a guess — and dealer rates run higher than these figures.
What does P0141 mean for your car?
This page explains what P0141 means in general. It cannot tell you which of those causes is yours, because that answer is in your car's own data. Kaiju Mechanic reads the codes your car is actually storing, plus live sensor data through any standard ELM327 adapter, and interprets it against your exact year, make, model and mileage. You can also just ask it about P0141 in chat — no adapter needed for that.
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