OBD-II code · Powertrain (generic, extended)
P23D4 Cylinder 1 Fuel Heater Performance
Cylinder 1 fuel heater is electrically intact yet does not deliver the expected heat - aged element or contact resistance high.
Is it safe to drive with P23D4?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater element aged
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.8 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Heater Cyl 1
Related codes
- P23D8Cylinder 2 Fuel Heater Performance
- P23DCCylinder 3 Fuel Heater Performance
- P23E0Cylinder 4 Fuel Heater Performance
- P23D1Cylinder 1 Fuel Heater Control Circuit Open
- P23D2Cylinder 1 Fuel Heater Control Circuit High
- P23D3Cylinder 1 Fuel Heater Control Circuit Low
- P23D5Cylinder 2 Fuel Heater Control Circuit Open
- P23D6Cylinder 2 Fuel Heater Control Circuit High
- P23D7Cylinder 2 Fuel Heater Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.