P0407 means the EGR position sensor 'B' is sending a voltage below the normal operating range. Sensor B exists on engines with dual EGR valves (V6 and V8 diesels) or on petrol engines that use a primary and secondary feedback sensor. The fault is almost always wiring or a failed sensor shorted to ground.
P0407 means the EGR position sensor 'B' is sending a voltage below the normal operating range. Sensor B exists on engines with dual EGR valves (V6 and V8 diesels) or on petrol engines that use a primary and secondary feedback sensor. The fault is almost always wiring or a failed sensor shorted to ground.
P0407 est un code defaut lie a emissions, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0407 et allume le voyant moteur.
Si ton vehicule a declenche P0407, tu peux remarquer un ou plusieurs de ces symptomes :
Voici les causes les plus courantes de P0407, classees selon la probabilite qu'elles soient en cause :
En general oui, pour des trajets courts. Driveable. P0407 affects the second EGR position sensor (sensor B), present on engines with dual EGR valves or dual feedback sensors. The ECU loses confidence in EGR position feedback and may disable EGR or enter limp mode on diesels. Failed emissions test is guaranteed.
Suis ces etapes pour identifier la cause profonde de P0407 :
Les couts de reparation de P0407 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
P0407 se comporte differemment selon ton vehicule. Selectionne ta voiture ci-dessous pour des causes propres au modele, les problemes connus et des estimations de couts ajustees :
2014–2024
P0407 on a 3 Series typically appears on the 330d and 335d with B57 inline-6 diesel, which uses two EGR feedback sensors (high-pressure and low-pressure EGR). Sensor B is usually the low-pressure EGR position. The harness for the low-pressure sensor routes near the rear of the engine and is prone to chafing where it crosses the transmission tunnel. ISTA is required for adaptation reset.
Couts estimes pour les proprietaires de BMW 3 Seriesajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a BMW
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
2012–2024
P0407 is uncommon on Golf TDIs because most 4-cylinder EA189/EA288 engines only have a single EGR position sensor. When it appears, it usually means the freeze frame labels the sole position sensor as 'B' in a market-specific calibration, or the vehicle has the rare high/low-pressure EGR variant fitted to some commercial Caddy and Crafter derivatives. VCDS confirms which sensor is at fault.
Couts estimes pour les proprietaires de Volkswagen Golfajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Volkswagen
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
2010–2024
P0407 is most common on the A4 3.0 TDI V6 (CCWA, CTBA, CAPA codes), which uses two EGR valves with two position sensors. Sensor B is the bank-2 EGR position. The harness for bank 2 routes behind the engine and is hard to access. Many shops replace both EGR valves together on high-mileage 3.0 TDI cars to avoid a repeat job. VCDS or ODIS adaptation reset for both banks is mandatory.
Couts estimes pour les proprietaires de Audi A4ajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Audi
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
2014–2024
OM642 V6 diesel Sprinters (3.0 CDI) use dual EGR valves with dual sensors. P0407 indicates the bank-2 (left bank) position sensor is reading low. OM651 4-cylinder Sprinters do not typically have a sensor B, so P0407 on an OM651 usually points to a wiring labeling issue. XENTRY required for proper adaptation reset on V6 OM642 after sensor or valve service.
Couts estimes pour les proprietaires de Mercedes Sprinterajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Mercedes-Benz
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
Ces codes apparaissent souvent avec P0407 ou indiquent des problemes connexes :
Sensor A is the primary EGR position feedback. Sensor B is the secondary, present on engines with two EGR valves (most V6/V8 diesels) or on engines that use a redundant feedback sensor. On most 4-cylinder engines there is no sensor B, so P0407 only appears on more complex setups (Audi 3.0 TDI V6, Mercedes V6 diesels, some BMW B57).
Short-term yes. The ECU disables the affected EGR bank and falls back on the other bank, causing uneven idle and reduced power. Diesels may enter limp mode. Plan the repair within a couple of weeks to avoid carbon buildup or DPF problems.
Usually no. P0407 on a 4-cylinder engine usually means the workshop manual labels the existing single sensor as 'B' due to manufacturer convention, or the engine has a primary plus secondary feedback (rare). On VW EA189/EA288, BMW N47/B47, and Mercedes OM651, the relevant code is normally P0405 not P0407.
Yes, in most cases. EGR sensor or valve replacement is far cheaper than dealing with a clogged DPF, NOx sensor faults, or AdBlue limp-mode countdown that result from continued EGR failure. On Audi 3.0 TDI V6 with dual EGR, budget for both sides to be inspected, since one failure often signals the other is close behind.
Branche un adaptateur OBD2 Bluetooth standard, scanne les codes et obtiens un diagnostic par IA avec niveaux de gravite et estimations des couts de reparation.
Telecharger Skanyx