P043D
Catalyst Temperature Sensor Circuit High Bank 2 Sensor 2
Auxiliary emissions control
Generic OBD-II
Medium
What it means
P043D means the ECM sees an abnormally high voltage from the catalyst temperature sensor on bank 2 (the cylinder bank without cylinder #1), at the sensor monitoring the downstream catalyst. This sensor tracks how hot the catalytic converter is running. It's a circuit fault — usually the sensor or its wiring — not a mechanical engine problem, so the car keeps driving normally.
Medium
Can I keep driving? Yes — the car drives normally; this is a monitoring-sensor fault, but the reading it feeds helps protect the catalytic converter, so don't leave it indefinitely.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no noticeable change in how the car drives
- May fail an emissions/readiness test
Common causes
Most likely first
- Faulty catalyst temperature sensor on bank 2Likely
- Short to voltage or open in the sensor wiring (high signal)Common
- Corroded or loose sensor connectorCommon
- Damaged wiring near the hot exhaustLess often
- Faulty ECM/PCM (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code is bank 2, sensor 2 (the sensor after the second catalyst).
- Inspect the sensor connector and harness for heat damage, chafing, or corrosion — common near the exhaust.
- Measure the sensor signal and compare against the other catalyst temp sensors with the engine warm.
- Repair wiring faults; if the circuit checks good, replace the catalyst temperature sensor.
- Clear the code and re-test to confirm it stays off.
FAQ
Quick answers
Is it safe to drive with P043D?+
Yes, in the short term — the car runs normally. But this sensor helps the ECM protect the catalytic converter from overheating, so have it fixed before long.
Can I just clear P043D?+
You can, but it will return until the sensor or its wiring is repaired. Clearing alone fixes nothing.
Related codes
Often seen with P043D
Read & clear P043D yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX