P03BA

Cylinder 4 Pressure Variation Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Misfire in cylinder 4
Unstable idle
Reduced engine power
Increased fuel consumption

Causes

Spark plug fault
Compression problems in the cylinder
Valves leaking
Piston ring wear
Fuel injector malfunction

How to Fix

Check the condition of the spark plug
Measure the compression in the cylinder
Inspect the valves and piston group
Check the operation of the fuel injector

Related codes

P0304 P0171 P0172