P0407: Exhaust gas recirculation sensor B circuit low
What the code tells you on its own
- System
- Powertrain
- Functional group
- EGR
- Subsystem
- Auxiliary emission controls
- Failure type byte, when the tool sends one
- 00 (No sub-type information)
Engine, fuel, air, ignition, emissions and transmission. The overwhelming majority of what workshops bring to the AI.
Scan tools report the same fault as P0407 and as P0407xx, where xx is a sub-type. They are one fault, and whether the sub-type appears at all depends on the tool and the protocol rather than on the car.
Diagnostics
What we see when P0407 turns up
Measured across the diagnostics run through Wrenchlane, not taken from a reference table. Figures as of 2026-10-06.
- Diagnostics
- 4
- Separate workshops
- 1
- Arrived code only
- 0%
- Most common marque
- Volkswagen
March 2026
Seen at a single shop so far
No symptom description entered at all
Where we have seen it most
These are counts from our own work, not a claim about how common the fault is across all vehicles. They describe what independent workshops brought to us, which is a narrower and more specific thing.
EGR
Other egr codes
- P0401 Exhaust gas recirculation flow insufficient
- P0400 Exhaust gas recirculation flow
- P0403 Exhaust gas recirculation control circuit
- P0402 Exhaust gas recirculation flow excessive
- P0404 Exhaust gas recirculation control circuit range/performance
- P0409 Exhaust gas recirculation sensor A circuit
- P2413 Exhaust gas recirculation system performance
FAQ
Frequently asked questions
How do I run a diagnosis?
Select the vehicle on Start, click the Diagnostic card and choose New diagnostic. Fill in the description, the error codes and the mileage, then click Analyze.
Do I have to type the codes from my scan tool?
No. Click the camera button next to Error codes and take or choose a photo of the scan tool's screen; WrenchLane reads the codes and their descriptions into the form. You can also speak them with the microphone.
Are the public fault code pages built from my diagnostics?
They use diagnostics run in WrenchLane, with no workshop, customer, registration number or VIN shown. Each fault code page shows how often the code was seen and in how many workshops.
Run P0407 against the car in front of you
Enter the code and the symptoms and get ranked probable causes for that specific vehicle, with the checks in the order worth doing them. Free account, no card.