P0436
Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1
Catalyst / emissions
Generic OBD-II
Medium
What it means
P0436 means the bank 2, sensor 1 catalyst temperature sensor is reading outside its expected range. This sensor tracks how hot the catalytic converter gets so the ECM can protect it and confirm it's working. The cause is usually the sensor itself or its wiring, and while the car normally drives fine, the emissions monitor won't complete until it's repaired.
Medium
Can I keep driving? Safe to keep driving in the short term — this is an emissions monitor fault — but it will prevent emissions readiness and should be repaired.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no noticeable change in how the car drives
- Catalyst monitor may not complete (readiness not set)
- Fails an emissions/smog test
Common causes
Most likely first
- Faulty catalyst temperature sensor (bank 2, sensor 1)Likely
- Damaged or corroded wiring/connector in the circuitCommon
- Sensor reading drifting out of its expected rangeCommon
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the fault is on bank 2, sensor 1.
- Inspect the sensor connector and wiring for heat damage or corrosion.
- Compare the sensor's reading against the other catalyst temperature sensors.
- Confirm reference voltage and ground at the sensor.
- Replace the catalyst temperature sensor if its reading is out of range; clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0436?+
Yes, generally. It's a catalyst temperature sensor range/performance fault that rarely changes drivability, but it stops the emissions monitor from completing, so fix it before a smog test.
Can I just clear P0436?+
It returns once the ECM sees the out-of-range reading again. The sensor or wiring must be repaired first.
Related codes
Often seen with P0436
Read & clear P0436 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