P034C

Ion Sense System Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Floating idle speed
Reduced engine power
Increased fuel consumption
Hard engine operation

Causes

Spark plug fault
Problems with the ignition system wiring harness
Low fuel quality
Mechanical damage to cylinders
Broken ignition coil

How to Fix

Check the condition of the spark plugs
Inspect the ignition system wiring harness
Diagnose ignition coils
Check compression in cylinders
If necessary, replace faulty components

Related codes

P0300 P0301 P0302 P0303 P0304