P23D4

Cylinder 1 Fuel Heater Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Difficulty starting the engine in cold weather
Unstable engine idling
Increased fuel consumption
Reduced engine power
Check Engine Light Illuminates

Causes

Cylinder 1 fuel heater malfunction
Open or short circuit in the heater circuit
Poor contact in heater connectors
Faulty heater circuit relay or fuse
Problems with the engine control unit (ECU)

How to Fix

Check the condition of the heater circuit fuse and relay
Check the integrity of the heater wiring and connectors
Measure the resistance of the fuel heater
If necessary, replace the fuel heater
Check the operation of the system after repair

Related codes

P23D0 P23D1 P23D2 P23D3