P04A8

Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased fuel consumption
Unstable engine operation
Power reduction
Check Engine Light Illuminates

Causes

Valve position sensor malfunction
Open or short circuit in wiring harness
Problems with the exhaust gas pressure control valve
ECU malfunction

How to Fix

Check the integrity of the wiring harness
Check valve position sensor
Check the operation of the exhaust gas pressure control valve
If necessary, replace the sensor or valve

Related codes

P04A7 P04A9 P0401