Q: P0171 and P0442 in a 2003 VW Jetta 1.8T. We bought it used 144k miles. Light came on before changing the air filter. Any solutions

asked by on

Bought the Jetta used at a good price. On the way to work the engine light came on got it checked out and said P0171 and P0442 EVAP codes, keep in mind this has happened before the air filter was replaced since i didn't know if the original owner has ever replaced it. So it says to most likely to replace the MAF but i dont know of to put down the money yet on a new part. Also as they were replacing the air filter they noticed there was huge handfuls of dust or dirt stuck in the filter so who knows if that has anything to do with this problem.

My car has 144540 miles.
My car has an automatic transmission.

Hi there. The two codes you’ve listed might indicate different problems than you’ve been told are the root source. The P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air. P0442 is present in vehicles that have a small leak in the EVAP system. Some of the causes of the EVAP code include a faulty or loose fuel cap, EVAP system line leak, charcoal canister leak, a fuel tank leak, or perhaps a failed vent or purge valve. The mass air flow sensor might be the right replacement for the first code, but there are other possible sources. It might be best to have a professional mechanic complete a check engine light inspection, so they can isolate the source of these codes and recommend the right repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. P0171 and P0442 in a 2003 VW Jetta 1.8T. We bought it used 144k miles. Light came on before changing the air filter. Any solutions

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Does my 2009 volkswagen jetta Wolfsburg edition 2.0t have a digital speedometer ?

The best way to determine if your vehicle has a digital speedometer is to check in the owner's manual. The owner's manual will tell you how to operate all functions of the vehicle as long as they are equipped with...

Q: Makes a clicking sound

A clicking or ticking sound can be coming from lots of components. Lack of engine oil, low oil level, or poor oil pressure can cause the engine to make a loud clicking or ticking sound. If it were the engine...

Q: Can't get a full tank of gas without pump stopping

The fuel tank venting system is plugged or blocked in some way. There is a two-way valve and a canister close valve that can cause the fuel tank to not get vented during fill up. Have these inspected and checked...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.