Catalyst Temperature Sensor Circuit High Bank 1 Sensor 2
What it means
P042D means the bank 1, sensor 2 catalyst temperature sensor circuit is reading high — usually an open circuit or a short to voltage. This sensor lets the ECM monitor converter temperature; a high, out-of-range reading sets the light but generally doesn't change how the engine starts or drives.
Can I keep driving? Safe to drive — this is a sensor-circuit fault that mainly turns on the warning light and affects emissions monitoring, not how the car runs.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Emissions readiness monitor may not complete
- Engine otherwise starts and runs normally
Common causes
Most likely first
- Sensor wiring open or shorted to voltageLikely
- Faulty catalyst temperature sensor (bank 1, sensor 2)Common
- Poor or corroded connectorCommon
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the sensor connector and wiring for an open or a short to voltage.
- Measure the sensor's resistance/signal against temperature.
- Replace the temperature sensor if it is out of spec.
- Repair the wiring or connector as needed.
- Clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P042D?+
Can I just clear P042D?+
Related codes
Read & clear P042D yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.