P01A4

Alternative Fuel Rail Pressure Sensor Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Unstable engine operation
Power reduction
Increased fuel consumption
Difficulty starting the engine

Causes

Fuel rail pressure sensor malfunction
Open or short circuit in wiring harness
Poor contact in the sensor connector
Sensor contamination
Problems with the fuel system (filter clogged, pump malfunction)

How to Fix

Check the integrity of the wiring harness and sensor connectors
Clean sensor contacts
Check the pressure in the fuel rail
Replace the fuel rail pressure sensor if necessary
Check the operation of the fuel pump and filter

Related codes

P01A0 P01A1 P01A2 P01A3