P03BB

Cylinder 4 Pressure Variation High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Unstable engine operation
Misfires
Power reduction
Increased fuel consumption
Engine vibration

Causes

Spark plug fault
Problems with the ignition coil
Dirty or faulty fuel injectors
Low cylinder compression
Damage to the piston or rings
Pressure sensor malfunction
Problems with the intake or exhaust system

How to Fix

Check spark plugs and replace if necessary
Test the ignition coil
Clean or replace fuel injectors
Check compression in cylinder
Inspect the condition of the piston and rings
Check the pressure sensor and its wiring harness
Diagnose the intake and exhaust system

Related codes

P0304 P0204 P0172 P0171 P0354