P0054: HO2S Heater Resistance Bank 1 Sensor 2

On bank 1, this monitor checks the heating element of sensor 2 behind the catalytic converter not for an open or short circuit, but for its resistance. Many systems measure it once after a genuine cold start, when coolant and intake air temperatures show that the sensor is at ambient temperature, and correct the value for temperature; some manufacturers evaluate the heater current instead. The code is set when the value lies outside the limits for this sensor type, typically because the element has aged. Since the test often runs only after a long standstill, the code may take a night to confirm or clear.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank. Sensor 2 is the sensor after the catalytic converter.

Symptoms

• Check engine light on, sometimes only after a cold start
• Readiness for the sensor heater stays incomplete
• Usually no drivability symptoms

Most likely causes

• Heating element aged or partly damaged
• Contact resistance or corrosion at connector or pins
• Replacement sensor with a different heater type fitted
• Engine control module faulty

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the wiring and connector of the sensor indicated
2. Look for exhaust leaks
3. Check the signal in live data with the engine warm
4. Check the fuse and the heater resistance if the code mentions it
5. Replace the sensor if it has power and does not respond

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P0054 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 0: Subsystem depends on the code range
• 54: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0054?

Yes, you can normally drive in moderation, but get it repaired soon: you will use more fuel and the catalytic converter can be damaged over time.

What causes code P0054?

The most common causes are: heating element aged or partly damaged; contact resistance or corrosion at connector or pins; replacement sensor with a different heater type fitted.

Related codes

• P0036HO2S Heater Control Circuit (Bank 1 Sensor 2)
• P0141O2 Sensor Heater Circuit Bank 1 Sensor 2
• P0060HO2S Heater Resistance Bank 2 Sensor 2

Sources

• law.cornell.edu: 13 CCR 1968.2
• saabwisonline.com: dtc p0030 p0036 p0053 p0054 p0135 or p0141
• gsi.ext.gm.com: 2005file12
• gsi.ext.gm.com: 07 GRP16 PHT ECM

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.