What P0405 means
Exhaust Gas Recirculation Sensor A Circuit Low
Common causes (general)
Before spending money on parts, verify the code with a scan tool and read freeze frame data. Freeze frame captures every sensor value at the moment the code set — this is often enough to figure out the root cause without further testing.
Manufacturer-specific descriptions
Different manufacturers use this code for slightly different failure modes. Here's what your specific make means by P0405:
| BMW | Exhaust Gas Recirculation Sensor "A" Circuit Low |
| FORD | EGR Sensor A Circuit Low Input |
| MITSUBISHI | Exhaust Gas Recirculation Sensor A Circuit Low; EGR lift sensor circuit low |
| NISSAN | Exhaust Gas Recirculation Sensor A Circuit Low |
| VOLKSWAGEN | Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage |
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