P0401 on Peugeot
Exhaust Gas Recirculation Flow Insufficient
P0401 on Peugeot vehicles indicates exhaust gas recirculation flow insufficient. Au7o has documented this code across 1 Peugeot model — most commonly on 308. This code means the Exhaust Gas Recirculation (EGR) system is not flowing enough exhaust back into the engine. The EGR system recirculates a small amount of exhaust into the intake to lower combustion temperatures and reduce nitrogen oxide (NOx) emissions; the computer has determined the actual flow is below what it commanded. The most common reason is carbon buildup clogging the EGR valve or its passages. You may notice pinging/knocking, rough idle, or a check engine light, and the car will fail emissions testing. Typical repair costs on Peugeot range from $200 to $600, depending on the specific model and root cause.
Common Causes of P0401
- •Carbon buildup clogging the EGR valve or passages
- •Stuck or faulty EGR valve
- •Blocked or restricted EGR ports/tubes
- •Faulty EGR temperature or position sensor
- •Faulty DPFE/EGR pressure sensor (on applicable systems)
- •Vacuum leak or failed vacuum control (vacuum-operated EGR)
- •Wiring or connector problems at the EGR valve
P0401 on Peugeot by Model
Peugeot 308(1 issue)
- EGR Valve Failure2007-2021
The exhaust gas recirculation valve on diesel 308 models becomes clogged with carbon deposits, causing rough idle and poor performance. The electrically actuated valve sticks in the open or closed position.
Looking for P0401 on a different make?
View P0401 across all makes →Frequently Asked Questions
What does P0401 mean on Peugeot?▼
P0401 stands for "Exhaust Gas Recirculation Flow Insufficient." This code means the Exhaust Gas Recirculation (EGR) system is not flowing enough exhaust back into the engine. The EGR system recirculates a small amount of exhaust into the intake to lower combustion temperatures and reduce nitrogen oxide (NOx) emissions; the computer has determined the actual flow is below what it commanded. The most common reason is carbon buildup clogging the EGR valve or its passages. You may notice pinging/knocking, rough idle, or a check engine light, and the car will fail emissions testing. On Peugeot specifically, this code is documented across 1 model.
What causes P0401 on Peugeot vehicles?▼
Common causes on Peugeot: Carbon buildup clogging the EGR valve or passages, Stuck or faulty EGR valve, Blocked or restricted EGR ports/tubes, Faulty EGR temperature or position sensor, Faulty DPFE/EGR pressure sensor (on applicable systems). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0401 on a Peugeot?▼
Repair costs on Peugeot range from $200 to $600, depending on the specific model and root cause.
Which Peugeot models have P0401 documented?▼
Au7o has documented P0401 on 1 Peugeot model: 308.