P0548
PowertrainTemperature Sensormoderate severityExhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1
What P0548 Means
The exhaust gas temperature (EGT) sensor for bank 1 sensor 1 is reading a voltage that is too high. This often means an open circuit or a failed sensor.
Symptoms
- Check engine light on
- Reduced engine power
- Possible increased emissions
Common Causes
- Faulty EGT sensor
- Open or high-resistance wiring
- Corroded connector
- Failed PCM circuit
Diagnostic Steps
- Scan and confirm the code
- Inspect EGT sensor connector and wiring
- Measure sensor resistance and compare to spec
- Replace EGT sensor if out of spec
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0548?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix