P03B9

Cylinder 4 Pressure Too High

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–222 (est.)

Symptoms

Loss of engine power
Detonation (knocking) in the engine
Unstable engine operation
Increased fuel consumption

Causes

Cylinder 4 injector malfunction
Problems with the ignition system (plugs, coils)
Mechanical damage to the engine (piston ring wear, scuffing)
Malfunction of the cylinder pressure sensor

How to Fix

Check the condition of the cylinder 4 injector
Check spark plugs and coil
Carry out compression diagnostics in the cylinders
Check the operation of the cylinder pressure sensor

Related codes

P0304 P0172 P0175