Cylinder 3 Injector Restricted
The P02A4 code indicates that the fuel injector for cylinder 3 is restricted or clogged, reducing fuel flow. This can cause a lean condition in that cylinder, leading to misfires, reduced power, and potential engine damage if not addressed. The restriction may be due to deposits, debris, or internal injector failure.
01. Most Common Causes
- Carbon deposits or varnish buildup in the injector
- Contaminated fuel (dirt, water, or debris)
- Failed injector internal components (stuck pintle, clogged nozzle)
02. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle, especially on cylinder 3
- Reduced engine power and poor acceleration
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P02A4 is present. Check freeze frame data for conditions.
Step 2: Perform a cylinder contribution test to confirm cylinder 3 is weak or misfiring.
Step 3: Inspect fuel injector electrical connector and wiring for damage or corrosion.
Step 4: Use a noid light or multimeter to check injector pulse signal from the ECM.
Step 5: Remove injector and perform a flow test or clean with an ultrasonic cleaner. Replace if restricted.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a restricted injector can cause misfires, catalytic converter damage, and engine performance issues. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a single injector cleaning or replacement, plus labor. Professional cleaning may cost less, while replacement is higher.