P0402 on Skoda
Exhaust Gas Recirculation Flow Excessive
P0402 on Skoda vehicles indicates exhaust gas recirculation flow excessive. Au7o has documented this code across 3 Skoda models — most commonly on Fabia, Octavia, Superb. P0402 means the Exhaust Gas Recirculation (EGR) system is flowing too much exhaust back into the intake. The EGR system intentionally routes a small amount of inert exhaust gas into the engine to lower combustion temperatures and reduce nitrogen-oxide emissions, but the flow must be metered precisely. When the PCM determines the flow is excessive — often because the EGR valve is stuck open or letting gas through when it shouldn't — it sets this code. Too much EGR can cause rough idle, stalling, hesitation, and a check engine light. Typical repair costs on Skoda range from $300 to $2,500, depending on the specific model and root cause.
Common Causes of P0402
- •EGR valve stuck open or not closing fully
- •Failed or sticking EGR valve diaphragm/solenoid
- •Carbon buildup holding the EGR valve open
- •Faulty EGR position or differential pressure (DPFE) sensor
- •Leaking EGR valve gasket or pintle seat
- •Vacuum control or solenoid fault commanding EGR open
- •Wiring or connector problems in the EGR control circuit
P0402 on Skoda by Model
Skoda Fabia(1 issue)
- 1.6 TDI (EA189) Dieselgate Recall and Post-Fix EGR/DPF Failures2010-2015
Fabia Mk2 1.6 TDI (and some 1.2 TDI) diesels use the EA189 common-rail engine caught in the VW Group emissions scandal; UK cars were recalled from 2016 for an NOx software 'fix'. Honest John confirms the Fabia 1.6 TDI EA189 (built c.2010-2015) was among affected cars. A widely reported side-effect is that, after the emissions update, EGR valves and DPFs clog or fail prematurely - owners report warning lights, limp mode, loss of power and poor economy, with VW Group later refunding/repairing many EGR failures. Short-trip urban use makes DPF regeneration problems worse.
Skoda Octavia(2 issues)
- 2.0 TDI EGR Cooler Failure (Dieselgate-Era Engines)2010-2020
Octavia 2.0 TDI engines (EA189 pre-2015 emissions update + EA288 post-Dieselgate) suffer EGR cooler failure where the cooler's internal coolant tubes crack. This leaks coolant into the intake manifold, causing white smoke, coolant loss, and eventual hydrolock. Compounded by post-Dieselgate emissions software update that increased EGR duty cycle, accelerating cooler stress. Class action across EU.
- 1.6 TDI (EA189) diesel injector and EGR valve failures2010-2019
The 1.6 TDI diesel (notably the EA189 generation involved in the 'Dieselgate' emissions case) is widely reported for injector failures and EGR valve/cooler problems, in many cases worsening after the post-Dieselgate emissions software 'fix' which increased EGR duty cycle. Failing injectors cause rough running, poor starting, smoke and high cost; clogged/failed EGR valves trigger the engine-management light and limp mode. A genuine, well-corroborated issue across Octavia Mk2/Mk3 diesels.
Skoda Superb(1 issue)
- 2.0 TDI EGR System and DPF Failure2008-2020
Same EGR cooler and DPF cluster as Octavia 2.0 TDI but more severely felt in Superb due to its motorway-heavy duty cycle. Post-Dieselgate emissions update accelerated DPF clogging in some cases. Failed EGR cooler can dump coolant into intake.
Looking for P0402 on a different make?
View P0402 across all makes →Frequently Asked Questions
What does P0402 mean on Skoda?▼
P0402 stands for "Exhaust Gas Recirculation Flow Excessive." P0402 means the Exhaust Gas Recirculation (EGR) system is flowing too much exhaust back into the intake. The EGR system intentionally routes a small amount of inert exhaust gas into the engine to lower combustion temperatures and reduce nitrogen-oxide emissions, but the flow must be metered precisely. When the PCM determines the flow is excessive — often because the EGR valve is stuck open or letting gas through when it shouldn't — it sets this code. Too much EGR can cause rough idle, stalling, hesitation, and a check engine light. On Skoda specifically, this code is documented across 3 models.
What causes P0402 on Skoda vehicles?▼
Common causes on Skoda: EGR valve stuck open or not closing fully, Failed or sticking EGR valve diaphragm/solenoid, Carbon buildup holding the EGR valve open, Faulty EGR position or differential pressure (DPFE) sensor, Leaking EGR valve gasket or pintle seat. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0402 on a Skoda?▼
Repair costs on Skoda range from $300 to $2,500, depending on the specific model and root cause.
Which Skoda models have P0402 documented?▼
Au7o has documented P0402 on 3 Skoda models: Fabia, Octavia, Superb.