P0422 means the main catalytic converter on Bank 1 has dropped below the efficiency threshold the ECU expects. It is similar to P0420 but used on some manufacturers (notably Chrysler, Jeep, and certain European platforms) to distinguish the main cat from the upstream warm-up cat in multi-brick exhaust systems.
P0422 means the main catalytic converter on Bank 1 has dropped below the efficiency threshold the ECU expects. It is similar to P0420 but used on some manufacturers (notably Chrysler, Jeep, and certain European platforms) to distinguish the main cat from the upstream warm-up cat in multi-brick exhaust systems.
P0422 est un code defaut lie a emissions, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0422 et allume le voyant moteur.
Si ton vehicule a declenche P0422, tu peux remarquer un ou plusieurs de ces symptomes :
Voici les causes les plus courantes de P0422, classees selon la probabilite qu'elles soient en cause :
En general oui, pour des trajets courts. Safe for normal driving. The check engine light will prevent emissions or periodic technical inspection passage. If the code is accompanied by rattling under the floor, the converter substrate may be breaking apart internally and replacement should be prioritised.
Suis ces etapes pour identifier la cause profonde de P0422 :
Les couts de reparation de P0422 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.
P0422 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 :
2006-2024
P0422 on BMW 3 Series with N52, N55, or B58 inline-6 engines typically points to the main underfloor cat rather than the manifold-mounted pre-cat. On these engines, the main cat is a separate unit that is easier and cheaper to replace than the integrated pre-cat. Check for VANOS rich-running history because long-term overfuelling will kill the main cat well before 200,000 km.
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.
2005-2024
On Golf TSI and TFSI models with the EA888 engine, the main cat sits in the underfloor section after the pre-cat. P0422 typically shows up at 180,000 to 220,000 km on healthy engines. If the car has any history of P0171 lean codes or P0300 misfires, the main cat will fail earlier. Always inspect the flex pipe upstream of the main cat for cracks because a small exhaust leak there mimics catalyst failure.
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.
2005-2024
The Audi A6 3.0 TFSI (EA837) and 3.0 TDI run separate main cats per bank. On Bank 1 (passenger side), the main cat is typically the first underfloor brick. P0422 here is often related to oil burning past the PCV system or, on TDI variants, soot loading from a stuck-open EGR valve. Check EGR operation before condemning the cat on diesel A6 variants.
Couts estimes pour les proprietaires de Audi A6ajuste 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.
2009-2024
On W212 and W213 E-Class with M276 V6 or M278 V8, P0422 commonly appears at 180,000 km. The Bank 1 main cat sits in the underfloor section and is accessible without dropping the subframe, which keeps labour reasonable compared to the pre-cat job. Check for any history of M276 balance-shaft gear wear, since that engine class has a known rough-running pattern that accelerates cat aging.
Couts estimes pour les proprietaires de Mercedes-Benz E-Classajuste 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 P0422 ou indiquent des problemes connexes :
Both indicate Bank 1 catalyst efficiency problems. P0420 is the generic OBD-II code used by most manufacturers. P0422 is used by some manufacturers (commonly Chrysler-Jeep and some European brands) to specifically label the main catalyst when the exhaust has a separate warm-up pre-cat and main cat. The diagnosis is essentially identical.
Yes. P0422 is a catalyst efficiency code and the check engine light alone is an automatic fail in most EU periodic technical inspections (TÜV in Germany, ITV in Spain, SKP in Poland, TA in Lithuania).
Yes, because the downstream O2 sensor is roughly five to ten times cheaper than the converter. If sensor switching is slow but other readings are normal, replacing the sensor first is the sensible step. About 20 to 30 percent of catalyst efficiency codes are actually sensor faults.
An OEM main cat installed in a healthy engine should last 200,000 km or more. Aftermarket units vary widely. A cheap aftermarket cat may fail again within 40,000 to 80,000 km, especially if any underlying fuel-trim or oil-consumption issue was not addressed first.
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.
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