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2020 Jetta GLI - Oil Consumption & CEL (P0171, P0441)

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Ryan M. · rep 0 · May 22, 4:36 AM · 1 replies · solved · Question

Vehicle: 2020 Volkswagen Jetta GLI

My 2020 Volkswagen Jetta GLI (2.0T engine) has been acting a bit strange lately. I've noticed a definite increase in oil consumption, and the engine sometimes has a rough idle, especially when cold. To top it off, the check engine light came on a few days ago.

I pulled the codes with my OBD scanner, and I'm getting P0171 (System Too Lean Bank 1) and P0441 (Evaporative Emission Control System Incorrect Purge Flow). From what I've read online, these codes, combined with the oil consumption, might point to a failing PCV valve.

Has anyone else experienced this with their GLI or similar VW 2.0T engine? Is replacing the PCV valve a straightforward DIY job, or are there any special tools or procedures I should be aware of? I'm hoping to tackle this myself if it's not too complex.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:36 AM

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ClearTheCode admin answer:

It sounds like you've accurately diagnosed a common issue with the 2.0T engine in your 2020 Volkswagen Jetta GLI. The combination of increased oil consumption, rough idle, and the specific OBD codes P0171 (System Too Lean Bank 1) and P0441 (Evaporative Emission Control System Incorrect Purge Flow) strongly suggests a failing PCV (Positive Crankcase Ventilation) valve.

Causes & Symptoms of a Failing PCV Valve:

  • Diaphragm Failure: The internal diaphragm in the PCV valve can tear, leading to a vacuum leak. This leak causes unmetered air to enter the intake, resulting in a lean condition (P0171).
  • Oil Consumption: A faulty PCV can allow excessive oil vapor to be drawn into the intake manifold, leading to increased oil consumption and potential carbon buildup.
  • Rough Idle/Misfires: The vacuum leak can disrupt air-fuel mixture, causing an erratic idle.
  • EVAP System Issues: The PCV system is integrated with the EVAP system, so a failure can trigger codes like P0441.

DIY Replacement:

Replacing the PCV valve on the 2.0T engine is a moderately challenging DIY task. It's typically located on top of the engine, often integrated into the valve cover or a separate housing.

  1. Tools: You'll need basic hand tools (sockets, screwdrivers), potentially a T25 or T30 Torx bit, and possibly a new gasket for the PCV housing.
  2. Procedure: The general steps involve removing the engine cover, disconnecting various hoses and electrical connectors, unbolting the PCV assembly, replacing it with a new OEM or high-quality aftermarket unit, and reassembling everything. Pay close attention to hose routing and ensure all connections are secure.
  3. Post-Replacement: After replacement, clear the fault codes with your OBD scanner. Drive the vehicle to allow the ECU to relearn fuel trims. Monitor for recurring symptoms or codes.

When to See a Shop:

If you're not comfortable with removing multiple components, dealing with potentially brittle plastic hoses, or if the issue persists after replacement, it's best to consult a professional mechanic. A shop can also perform a smoke test to confirm vacuum leaks if the PCV replacement doesn't fully resolve the P0171 code.

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