O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
Code P0141 indicates an open circuit or burned heating element in downstream Oxygen Sensor 2 on Bank 1. Sensor 2 monitors catalytic converter health; its heater warms the sensor to 600°F. If the internal heating wire snaps, P0141 is flagged.
Measure resistance across the two identical heater wires on the unplugged sensor with a multimeter. A good heater reads 6-16 Ohms. If your meter reads OL (Open Loop), the sensor heating element is burned out. Replace the downstream sensor.
Interactive Symptom Pinpoint Troubleshooter
Answer 2 diagnostic tests to isolate the exact component failure for P0141.
Does your multimeter read OL (Open Loop) across the two heater pins on the unplugged sensor?
Live Scanner & Multimeter Benchmark Values
Compare your live OBD-II PID sensor data against OEM factory operating specs for P0141.
| Monitored Parameter / Sensor PID | Healthy OEM Operating Range | Fault Threshold (Triggers P0141) |
|---|---|---|
| Downstream O2 Heater Resistance (Cold) | 6.0 – 16.0 Ohms | OL (Open Loop) confirms severed heating element |
| Heater Supply Voltage (Key On) | 11.8V – 14.4V B+ | 0V indicates blown fuse or bad relay |
Symptoms Associated with P0141
Drivers typically observe the following symptoms when the ECM flags P0141:
Common Root Causes & Statistical Probability Matrix
Statistical breakdown of what triggers this code based on automotive repair shop data.
Step-by-Step Diagnostic & Repair Procedure
Follow this logical order to isolate and repair P0141 before spending money on costly parts.
Step 1: Measure Heater Resistance with Multimeter
Unplug sensor. Measure resistance across the two matching color wires. 6-16 Ohms is good; OL is dead.
Step 2: Check Underhood Heater Fuse
Probe both test pads on the O2 HTR fuse with key ON.
Step 3: Unscrew and Replace Sensor
Spray threads with penetrating oil on cold exhaust. Unscrew with slotted socket and torque new sensor.
Vehicle-Specific Failure Trends & Technical Bulletins
Real workshop failure patterns reported by mechanics across popular makes and models for P0141.
Honda Civic / Accord
Subaru Outback / Forester
Dave Miller, ASE Master Tech
ASE L1 Certified Master ReviewerASE Certified Master Automobile Technician (A1-A8) & L1 Advanced Engine Performance • 24 years automotive diagnostic experience
“Always verify sensor voltages and harness grounds before purchasing replacement electronic components.”