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DTC/P0433

P0433 : Heated Catalyst Efficiency Below Threshold (Bank 2)

Quick Answer
Moderee GraviteConduite possible (a court terme)Emissions

P0433 means the electrically heated catalyst on Bank 2 (an e-cat with an integrated resistive heating element used on newer Euro 6 and 6d vehicles to reach light-off temperature within seconds of start) is not converting emissions efficiently. It only applies to multi-bank engines, so V6, V8, V10, V12, or flat configurations.

Cout de reparation estimeDe 130 € a 2560 €+, varie selon le vehicule

Que signifie P0433 ?

P0433 means the electrically heated catalyst on Bank 2 (an e-cat with an integrated resistive heating element used on newer Euro 6 and 6d vehicles to reach light-off temperature within seconds of start) is not converting emissions efficiently. It only applies to multi-bank engines, so V6, V8, V10, V12, or flat configurations.

P0433 est un code defaut lie a emissions, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0433 et allume le voyant moteur.

Quels sont les symptomes de P0433 ?

Si ton vehicule a declenche P0433, tu peux remarquer un ou plusieurs de ces symptomes :

  • Check engine light illuminated, often within the first minute after start
  • Elevated cold-start emissions on the Bank 2 side, visible on a cold morning
  • Slight reduction in fuel economy
  • Possible faint sulfur smell during warm-up
  • Failed emissions test or periodic technical inspection

Quelles sont les causes de P0433 ?

Voici les causes les plus courantes de P0433, classees selon la probabilite qu'elles soient en cause :

eleveeFailed Bank 2 e-cat heater element or substrate degradation
moyenneFaulty downstream O2 sensor (Bank 2, Sensor 2)
moyenneWiring or connector fault to the Bank 2 e-cat heater control module
faiblePrior misfire on Bank 2 cylinders damaging the heated brick
faibleOil consumption from Bank 2 fouling the substrate

Peut-on rouler sans risque avec P0433 ?

En general oui, pour des trajets courts. Safe for short-term driving. Heated catalyst codes typically appear on newer Euro 6 and 6d vehicles with electrically heated catalysts (e-cats). P0433 only applies to V6, V8, V10, V12, or flat-engine vehicles since Bank 2 must exist. Cold-start emissions will be elevated.

Comment diagnostique-t-on P0433 ?

Suis ces etapes pour identifier la cause profonde de P0433 :

  1. Confirm the engine is multi-bank (V6, V8, V10, V12, or flat). P0433 on an inline engine indicates scan-tool or wiring error
  2. Read freeze frame and confirm the code triggered shortly after cold start, which is typical of heated catalyst faults
  3. Check for companion heater-circuit codes such as P0432, P0434, or manufacturer-specific heater faults
  4. Measure resistance of the Bank 2 e-cat heater element per OEM spec (typical 0.3 to 2.0 ohms)
  5. Graph Bank 2 downstream O2 sensor during cold start. A healthy heated cat stabilises within 20 to 40 seconds

Combien coute la reparation de P0433 ?

Les couts de reparation de P0433 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace heated catalytic converter (Bank 2) €650–€2200 €140–€360 €790–€2560 Professionnel
Replace downstream O2 sensor (Bank 2) €65–€190 €70–€150 €135–€340 Moderee
Fix exhaust leak on Bank 2 (gasket or flex pipe) €30–€130 €100–€240 €130–€370 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

P0433 sur des vehicules specifiques

P0433 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 :

BMW

P0433 sur BMW 3 Series

2020-2024

P0433 on the G20 3 Series applies to the M3 (S58 twin-turbo inline-6) and high-output xDrive variants that received Bank 2 e-cat hardware as part of Euro 6d-Full compliance from 2020 onward. The S58 has a per-bank heated pre-cat assembly, and Bank 2 e-cat failure is documented after 80,000 km on cars used in heavy start-stop urban driving. BMW often replaces the entire manifold-and-e-cat assembly under emissions warranty.

Quelles sont les causes de P0433 sur une BMW 3 Series ?

BMW 3 SeriesS58 Bank 2 e-cat heater element failure after 80,000 km in start-stop use
BMW 3 SeriesManifold-integrated assembly requires full unit replacement under warranty

Cout de reparation de P0433 pour BMW 3 Series

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

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace heated catalytic converter (Bank 2) €910–€3080 €196–€504 €1106–€3584 Professionnel
Replace downstream O2 sensor (Bank 2) €91–€266 €98–€210 €189–€476 Moderee
Fix exhaust leak on Bank 2 (gasket or flex pipe) €42–€182 €140–€336 €182–€518 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Volkswagen

P0433 sur Volkswagen Touareg

2019-2024

The CR Touareg with 3.0 TFSI V6 (EA839) and 4.0 TFSI V8 mild-hybrid powertrains uses heated catalysts on both banks from 2019 onward. P0433 on Bank 2 typically traces back to either the 48V battery losing capacity in cold climates or to corrosion at the Bank 2 heater connector, which sits near the subframe and collects road spray.

Quelles sont les causes de P0433 sur une Volkswagen Touareg ?

Volkswagen Touareg48V battery capacity loss in cold climates starving Bank 2 heater
Volkswagen TouaregBank 2 heater connector corrosion from road spray near subframe

Cout de reparation de P0433 pour Volkswagen Touareg

Couts estimes pour les proprietaires de Volkswagen Touaregajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Volkswagen

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace heated catalytic converter (Bank 2) €975–€3300 €210–€540 €1185–€3840 Professionnel
Replace downstream O2 sensor (Bank 2) €98–€285 €105–€225 €203–€510 Moderee
Fix exhaust leak on Bank 2 (gasket or flex pipe) €45–€195 €150–€360 €195–€555 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Audi

P0433 sur Audi A6

2019-2024

The C8 Audi A6 3.0 TFSI (EA839 V6 mild-hybrid) and 3.0 TDI mild-hybrid both use a heated catalyst on Bank 2. P0433 is commonly triggered after winter storage when the 48V battery has self-discharged, or after 120,000 km when the heater element ages. Audi service procedure mandates a 48V system check (battery health and DC-DC ripple) before any e-cat replacement is authorised under warranty.

Quelles sont les causes de P0433 sur une Audi A6 ?

Audi A6Winter 48V battery self-discharge starving Bank 2 heater on start
Audi A6EA839 Bank 2 e-cat heater aging around 120,000 km

Cout de reparation de P0433 pour Audi A6

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

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace heated catalytic converter (Bank 2) €845–€2860 €182–€468 €1027–€3328 Professionnel
Replace downstream O2 sensor (Bank 2) €85–€247 €91–€195 €176–€442 Moderee
Fix exhaust leak on Bank 2 (gasket or flex pipe) €39–€169 €130–€312 €169–€481 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Mercedes-Benz

P0433 sur Mercedes-Benz E-Class

2019-2024

On the W213 facelift E-Class with M256 inline-6 mild-hybrid and M177 V8 (E63), Bank 2 carries its own e-cat assembly. P0433 typically traces back to integrated starter-generator faults that reduce supply voltage to the Bank 2 heater. Mercedes XENTRY procedure requires an ISG software update and a full 48V battery test before catalyst replacement is authorised under emissions warranty.

Quelles sont les causes de P0433 sur une Mercedes-Benz E-Class ?

Mercedes-Benz E-ClassISG control unit software fault reducing Bank 2 heater supply voltage
Mercedes-Benz E-ClassM177 V8 Bank 2 e-cat substrate cracking under repeated start-stop cycling

Cout de reparation de P0433 pour Mercedes-Benz E-Class

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

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace heated catalytic converter (Bank 2) €910–€3080 €196–€504 €1106–€3584 Professionnel
Replace downstream O2 sensor (Bank 2) €91–€266 €98–€210 €189–€476 Moderee
Fix exhaust leak on Bank 2 (gasket or flex pipe) €42–€182 €140–€336 €182–€518 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Ces codes apparaissent souvent avec P0433 ou indiquent des problemes connexes :

P0420P0423P0430P0432P0434

Questions frequentes sur P0433

Which engines actually have a heated catalyst on Bank 2?

Heated catalysts on Bank 2 appear on Euro 6d and 6d-Full multi-bank engines from roughly 2019 onward, especially mild-hybrid 48V V6 and V8 powertrains. Examples include Audi 3.0 TFSI (EA839), Mercedes M256 inline-6, BMW B58 in mild-hybrid spec, and Mercedes M177 V8 in late C63 and E63 variants. Older non-hybrid V6 and V8 engines typically do not have e-cats.

Why does only Bank 2 set P0433 when both banks have e-cats?

The two banks have separate heater circuits and separate downstream O2 sensors. If a single wire, connector, or heater element fails on Bank 2 alone, only Bank 2 will set the code. Fuel-trim asymmetry between banks (caused by intake manifold geometry or injector wear) can also age one bank's heated cat faster than the other.

Can a 48V mild-hybrid system fault trigger P0433?

Yes. The e-cat heater is supplied by the 48V network on most modern mild-hybrid platforms. A weak 48V battery, a degraded DC-DC converter, or an integrated starter-generator output fault can starve the Bank 2 heater of current and trigger P0433. Always test the 48V system health before replacing the catalyst itself.

Will my warranty cover a P0433 repair?

Emissions components in the EU typically carry an extended emissions warranty of five years or 100,000 km, sometimes longer. Heated catalysts qualify under this warranty on most manufacturers. Check your service book or dealer for the specific terms before paying for an out-of-warranty replacement.

Skanyx

Scanne ta voiture avec Skanyx pour diagnostiquer P0433

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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