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Cardoctor74
Cardoctor74, ASE Certified Technician
Category: VW
Satisfied Customers: 25954
Experience:  Certified to fix all makes and models
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2002 Jetta 1.8T engine codes-p0171,p301,p303 stuff idle

Customer Question

2002 Jetta 1.8T engine codes-p0171,p301,p303 stuff idle
Submitted: 7 years ago.
Category: VW
Expert:  Cardoctor74 replied 7 years ago.
The p0171 is usually caused by a vacuum leak or fuel pressure problem.It can lso cause the misfire codes.There are also issues with the coils failing on these cars .You can swap coils for 1 and 3 cylinders to 2 and 4 and see if the codes goes to 2 and 4 cylinder misfires if so those coils are bad.

SAEVAGDescription
P017116555System Too Lean Bank 1

Exhaust system

Fuel injectors

Fuel pressure regulator and residual pressure

Fuel Pump (FP)

Intake system

Secondary Air Injection (AIR) system

Note: Check vacuum lines for leaks.
These are the nextg steps and most common issues check for vacuum leaks first.

Hoped this helped.

Positive feedback and bonuses greatly appreciated.
Customer: replied 7 years ago.
do you think it could be throttle body, ruff idle
Expert:  Cardoctor74 replied 7 years ago.
No that will not cause a rough idle it will usually cause a stalling issue or fluctuating idle.What I stated is what will usually cause these issues and is what you should check first .Unless it jumped times these need to be checked first.Hoped this helped.

Positive feedback and bonuses greatly appreciated.
Customer: replied 7 years ago.
I click on the answers that you think we help fix this car and it won't let me in that page. It want a login and password, is that more money???
Expert:  Cardoctor74 replied 7 years ago.
No it's not supposed to let you in these ate the issues that it can be .

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