Cylinder 5 Injector Leak
The P02AD code indicates that the engine control module (ECM) has detected a leak in the fuel injector for cylinder 5. This can be caused by a stuck-open injector, a damaged O-ring, or a cracked injector body, leading to excessive fuel entering the cylinder, which can cause misfires, rough idle, and potential catalytic converter damage.
01. Most Common Causes
- Faulty fuel injector (stuck open or leaking internally)
- Damaged or worn injector O-ring
- Cracked injector body or fuel rail
- Contaminated fuel causing injector sticking
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 5
- Poor fuel economy
- Fuel smell from exhaust or engine bay
03. Step-by-Step Diagnosis
Step 1: Scan for codes and confirm P02AD is present.
Step 2: Perform a fuel pressure test to check for excessive pressure drop.
Step 3: Inspect injector electrical connector and wiring for damage.
Step 4: Use a stethoscope to listen for injector clicking; a leaking injector may not click properly.
Step 5: Remove injector and perform a leak test using a fuel injector tester.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. A leaking injector can cause misfires, damage the catalytic converter, and lead to engine damage from fuel dilution of oil.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a single injector replacement, including parts and labor, but may vary based on vehicle make and model.