Skip to content
Skanyx

P0402 on Volkswagen: Causes, Symptoms and Fix Cost

Quick Answer

Safe to drive (short-term)

P0402 on a Volkswagen means the EGR system is flowing too much exhaust gas back into the intake manifold. The most common cause is an EGR valve stuck partially open, often due to carbon buildup on the valve seat. Diesel engines are especially vulnerable because of higher soot output.

Severity
Moderate · Emissions
Typical repair cost, all makes
€68-€1400

Connect a standard OBD2 adapter (Bluetooth LE on iPhone) to your Volkswagen and Skanyx tells you what P0402 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.

Get Skanyx free

What does P0402 mean on a Volkswagen?

The Quick Answer above is the generic definition. What follows is the model-specific detail for the Volkswagen models that log P0402.

Volkswagen Golf

2009-2024

Golf TDI models with the EA189 and its successor, the EA288, build carbon at the EGR valve seat, and a valve that cannot close fully sets P0402. Cleaning the valve and the intake manifold passages often restores normal operation; if the valve's motor or position sensor has failed, it needs replacing.

What causes P0402 on a Volkswagen?

Beyond the generic causes listed on the main P0402 page, these are the patterns noted for Volkswagen models:

  • Carbon at the EGR valve seat on EA189 and EA288 TDI engines stopping the valve closing fully

    : Volkswagen Golf

  • Carbon-restricted intake manifold passages on high-mileage TDI engines

    : Volkswagen Golf

How to diagnose P0402 on a Volkswagen with OBD2

  1. Read freeze frame data and check whether the fault appears at idle, cruise, or under load
  2. Remove the EGR valve and inspect the seat and pintle for carbon buildup preventing full closure
  3. Command the EGR valve closed with manufacturer-level software (a generic OBD2 reader cannot run this test) and verify it seats fully (position sensor should read 0%)
  4. Inspect vacuum hoses (vacuum-operated systems) for leaks that hold the valve cracked open
  5. On diesel engines, inspect the EGR cooler for internal damage and verify the MAP sensor reads correctly against a known-good reference

How much does P0402 cost to fix on a Volkswagen? (EUR)

Estimated repair costs for P0402 in EUR, compiled across makes. Expect Volkswagen parts and labour towards the upper end of each range.

Repair Parts Cost Labor Cost Total Estimate DIY Difficulty
Clean EGR valve and passages €8–€25 €60–€180 €68–€205 Moderate
Replace EGR valve (petrol or diesel) €150–€450 €80–€220 €230–€670 Moderate
Replace EGR cooler assembly (diesel) €300–€800 €250–€600 €550–€1400 Professional

Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.

These codes are often seen alongside P0402 or point to related issues, on any make:

Looking for the full P0402 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P0402 guide

Diagnose P0402 on your Volkswagen

Get Skanyx free