P03B1

Cylinder 3 Pressure Variation High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Misfire in cylinder 3
Unstable engine operation
Power Loss
Increased fuel consumption

Causes

Defective spark plugs
Problems with the ignition coil
Fuel injector malfunction
Compression leak in cylinder
Pressure sensor damage
Valve contamination
Broken cylinder head gasket

How to Fix

Check spark plugs and replace if necessary
Check the ignition coil on cylinder 3
Check the condition of the fuel injector
Perform a cylinder compression test
Check the tightness of the combustion chamber
Check the wiring to the pressure sensor
Scan the system for other errors

Related codes

P0303 P0172 P0175 P0203