2003 Volkswagen Jetta fails emissions testing

Keeps failing emissions testing. States “Lean” I keep replacing O2 sensors but this fix only lasts 24 hours. Need a proper fix.

Then give us a proper explanation of your problem and some amount of information about your car. Like the error codes your car is setting causing you to change O2 sensors. Like the mileage on the car and the engine the car has.

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