P043D
Catalyst Temperature Sensor Circuit High
Catalyst temperature sensor at bank 2 sensor 2 above upper plausibility — open signal or short to B+.
Catalyst temperature sensor at bank 2 sensor 2 above upper plausibility — open signal or short to B+.
Common causes
- high
Open signal line
One of the most commonly reported causes for this code — check this first.
Typical part cost: $70-550
- low
Connector pins corroded - high contact resistance
Less common, but worth ruling out after the more likely causes.
Typical part cost: $70-550
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P043D.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P043D.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P043D.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P043D mean?
P043D means "Catalyst Temperature Sensor Circuit High (Bank 2 Sensor 2)". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P043D?
open signal line; connector pins corroded - high contact resistance; supply wire pinched against b+ source — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P043D diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.