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P1127
Heated oxygen sensor (HO2S) 2 (downstream), bank 1 - exhaust not warm enough / sensor not tested
Heated oxygen sensor (HO2S) 2 (downstream), bank 1 - exhaust not warm enough / sensor not tested
Applies to: All X-TYPE variants, 2001-2009 (saloon & estate) · Confidence: Manufacturer code list + field-verified causes
Common causes
- Thermostat stuck open (engine never reaches temperature)
- Exhaust leak cooling the sensor
- Sensor heater fault
Quick checks
- Scan access: Jaguar-specific: WDS/IDS or a Jaguar-capable scan tool
- Prefer official/field-verified path before guessing sensors
Typical fixes
- Replace the thermostat
- Repair exhaust leaks
- Check sensor heater circuit