Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected that the fuel mixture for cylinder 2 is too lean, meaning there isn't enough fuel being mixed with the air.
The Engine Control Module (ECM) monitors the air-fuel mixture in each cylinder. If it detects that the mixture in cylinder 2 is too lean (not enough fuel), it sets this code.
The P029F code indicates that the fuel trim for cylinder 2 has reached its minimum limit. This means the ECM is unable to add more fuel to achieve the desired air-fuel ratio. This could be due to a vacuum leak, faulty fuel injector, or other issues affecting fuel delivery.
• Check Engine Light on
• Rough idle
• Poor fuel economy
• Engine misfire
• Reduced engine performance
• Vacuum leak near cylinder 2
• Faulty or clogged fuel injector for cylinder 2
• Fuel pressure issues
• Faulty oxygen sensor
• Exhaust leak near sensor
ECM: Engine Control Module
Fuel Trim: Adjustments made by the ECM to the air-fuel mixture
• Check for vacuum leaks near cylinder 2
• Inspect and test the fuel injector for cylinder 2
• Check fuel pressure
• Inspect oxygen sensors
• Check for exhaust leaks
• Repair any vacuum leaks
• Clean or replace the fuel injector
• Adjust or repair fuel pressure issues
• Replace faulty oxygen sensor
• Repair exhaust leaks
• OBD-II scanner
• Fuel pressure gauge
• Vacuum gauge
• Multimeter
• Fuel injector cleaner
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly maintain fuel system
• Check for vacuum leaks periodically
• Use quality fuel
Engine Performance
• Do not ignore the Check Engine Light
• Address fuel economy issues promptly
Check with your vehicle manufacturer for warranty coverage on fuel system components.
This code has been associated with lean condition issues in various vehicle models, often due to vacuum leaks or injector problems.
Moderate – Addressing this issue can prevent further engine damage and improve performance.
Driving with a lean condition can lead to engine damage. It's advisable to address this issue promptly.
• Engine at operating temperature
• Vehicle in closed-loop operation
Cylinder 2 is located in the engine block, typically on the passenger side for V-type engines.
Q: Can I drive my car with a P029F code?
A: It's not recommended to drive for extended periods with this code as it can lead to engine damage.
Q: How can I prevent this code from appearing?
A: Regular maintenance of the fuel system and checking for leaks can help prevent this issue.
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Fitment Required · Vehicle-fitment part
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.