P0405 on Opel
Exhaust Gas Recirculation Sensor 'A' Circuit Low
P0405 on Opel vehicles indicates exhaust gas recirculation sensor 'a' circuit low. Au7o has documented this code across 1 Opel model — most commonly on Astra. P0405 is a generic OBD-II code meaning the engine computer detected an abnormally low voltage signal from the Exhaust Gas Recirculation (EGR) sensor 'A' circuit. This sensor reports the EGR valve's position or flow, which the computer uses to control exhaust gas recirculation for lowering emissions and combustion temperatures. A low signal indicates the reading is below the expected range, often due to a wiring or sensor fault. It mainly affects emissions and may cause light drivability issues but is not an immediate safety concern. Typical repair costs on Opel range from $400 to $1,200, depending on the specific model and root cause.
Common Causes of P0405
- •Faulty EGR position sensor (or DPFE sensor)
- •Open, shorted, or corroded EGR sensor wiring/connector
- •EGR valve stuck or carbon-clogged
- •Loss of reference voltage or ground to the sensor
- •Poor connector contact / pin corrosion
- •Damaged EGR valve assembly
- •PCM fault (rare)
P0405 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 P0405 across all makes →Frequently Asked Questions
What does P0405 mean on Opel?▼
P0405 stands for "Exhaust Gas Recirculation Sensor 'A' Circuit Low." P0405 is a generic OBD-II code meaning the engine computer detected an abnormally low voltage signal from the Exhaust Gas Recirculation (EGR) sensor 'A' circuit. This sensor reports the EGR valve's position or flow, which the computer uses to control exhaust gas recirculation for lowering emissions and combustion temperatures. A low signal indicates the reading is below the expected range, often due to a wiring or sensor fault. It mainly affects emissions and may cause light drivability issues but is not an immediate safety concern. On Opel specifically, this code is documented across 1 model.
What causes P0405 on Opel vehicles?▼
Common causes on Opel: Faulty EGR position sensor (or DPFE sensor), Open, shorted, or corroded EGR sensor wiring/connector, EGR valve stuck or carbon-clogged, Loss of reference voltage or ground to the sensor, Poor connector contact / pin corrosion. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0405 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 P0405 documented?▼
Au7o has documented P0405 on 1 Opel model: Astra.