P0404 on Skoda
Exhaust Gas Recirculation Circuit Range/Performance
P0404 on Skoda vehicles indicates exhaust gas recirculation circuit range/performance. Au7o has documented this code across 1 Skoda model — most commonly on Octavia. This code means the exhaust gas recirculation (EGR) system isn't performing within its expected range. The EGR valve routes a metered amount of exhaust gas back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer monitors the valve's actual position versus what it commanded. When the valve sticks, moves incorrectly, or the feedback doesn't match the command, P0404 sets. This can cause rough idle, hesitation, pinging, and increased emissions. Typical repair costs on Skoda range from $500 to $1,400, depending on the specific model and root cause.
Common Causes of P0404
- •Carbon buildup clogging the EGR valve or passages
- •Sticking or failed EGR valve
- •Faulty EGR position sensor
- •Corroded or loose EGR connector
- •Damaged or shorted EGR wiring
- •Vacuum leak or failed vacuum control (on vacuum-operated systems)
- •Clogged EGR cooler or tubes
- •Faulty PCM/ECM (rare)
P0404 on Skoda by Model
Skoda Octavia(1 issue)
- 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.
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View P0404 across all makes →Frequently Asked Questions
What does P0404 mean on Skoda?▼
P0404 stands for "Exhaust Gas Recirculation Circuit Range/Performance." This code means the exhaust gas recirculation (EGR) system isn't performing within its expected range. The EGR valve routes a metered amount of exhaust gas back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer monitors the valve's actual position versus what it commanded. When the valve sticks, moves incorrectly, or the feedback doesn't match the command, P0404 sets. This can cause rough idle, hesitation, pinging, and increased emissions. On Skoda specifically, this code is documented across 1 model.
What causes P0404 on Skoda vehicles?▼
Common causes on Skoda: Carbon buildup clogging the EGR valve or passages, Sticking or failed EGR valve, Faulty EGR position sensor, Corroded or loose EGR connector, Damaged or shorted EGR wiring. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0404 on a Skoda?▼
Repair costs on Skoda range from $500 to $1,400, depending on the specific model and root cause.
Which Skoda models have P0404 documented?▼
Au7o has documented P0404 on 1 Skoda model: Octavia.