P0404 on SEAT
Exhaust Gas Recirculation Circuit Range/Performance
P0404 on SEAT vehicles indicates exhaust gas recirculation circuit range/performance. Au7o has documented this code across 1 SEAT model — most commonly on Ibiza. 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 SEAT range from $250 to $1,200, 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 SEAT by Model
SEAT Ibiza(1 issue)
- 1.6 TDI (EA189) EGR Valve Failure - Aggravated by Dieselgate Emissions Fix2009-2016
The 1.6 TDI (and related 1.2/1.9 TDI) diesels are prone to EGR valve clogging and failure, with carbon build-up causing limp mode, black smoke and power loss. On the EA189 engine the EGR shares its casing with a heat exchanger/cooler, making it an expensive component to replace, and it is awkwardly located at the back of the engine raising labour costs. Crucially, the issue became much more prevalent after the Dieselgate NOx emissions software fix (rolled out for SEAT 1.6/2.0 TDI from January 2016 and 1.2 TDI from April 2016) - the recalibration increased EGR duty cycle and many owners reported EGR failures shortly after the 'fix' was applied. VW Group has in some cases refunded owners for post-fix EGR failures.
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View P0404 across all makes →Frequently Asked Questions
What does P0404 mean on SEAT?▼
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 SEAT specifically, this code is documented across 1 model.
What causes P0404 on SEAT vehicles?▼
Common causes on SEAT: 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 SEAT?▼
Repair costs on SEAT range from $250 to $1,200, depending on the specific model and root cause.
Which SEAT models have P0404 documented?▼
Au7o has documented P0404 on 1 SEAT model: Ibiza.