P0404 on Opel
Exhaust Gas Recirculation Circuit Range/Performance
P0404 on Opel vehicles indicates exhaust gas recirculation circuit range/performance. Au7o has documented this code across 1 Opel model — most commonly on Astra. 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 Opel range from $400 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 Opel by Model
Opel Astra(1 issue)
- Astra J 1.7 CDTI EGR Valve Clogging2009-2015
The A17DTR/A17DTS 1.7 CDTI diesel in Astra J (2009-2015), Mokka A, and Meriva B suffers severe EGR valve carbon buildup, typically presenting between 80,000-150,000 km. Symptoms include power loss, limp mode, and rough idle. The EGR cooler can also crack, mixing coolant with intake flow.
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View P0404 across all makes →Frequently Asked Questions
What does P0404 mean on Opel?▼
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 Opel specifically, this code is documented across 1 model.
What causes P0404 on Opel vehicles?▼
Common causes on Opel: 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 Opel?▼
Repair costs on Opel range from $400 to $1,200, depending on the specific model and root cause.
Which Opel models have P0404 documented?▼
Au7o has documented P0404 on 1 Opel model: Astra.