P0431
Warm Up Catalyst Efficiency Below Threshold (Bank 2)
DTC P0431, sometimes indicated as P043100 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the auxiliary emissions system causing warm up catalyst efficiency below threshold (bank 2).
The exhaust system on a car contains a number of different devices that work together to reduce emissions. One of these devices is the catalytic converter. The catalytic converter helps reduce emissions by converting harmful pollutants into less harmful emissions. The catalytic converter has a number of different elements inside of it, and one of these elements is a catalyst. The catalyst helps speed up the conversion process.
The catalytic converter has a warm up phase, and during this phase, the catalyst is not as effective as it is during the steady state phase. The DTC P0431 code is set when the catalyst efficiency falls below a certain level during the warm up phase.
There are a few things that can cause the catalyst efficiency to fall below the threshold level. One of the most common causes is a misfire. A misfire can cause the catalyst to become overloaded and can lead to a decrease in the converter's efficiency.
There are a few things that can be done to address a DTC P0431 code. One of the most common things is to address any misfires that may be present. If there are any misfires, they need to be addressed in order to
- P0431: Warm Up Catalyst Efficiency Below Threshold (Bank 2)
- P0431: Warm Up Catalyst Efficiency Below Threshold Bank 2
- P0431: Warm Up Catalyst Below Threshold (Bank 2)
- P0431: Warm up catalytic converter, bank 2 – efficiency below threshold
- P0431 00: The efficiency of the heated catalyst (cylinder row 1) for the mafa
- P0431 00: Warm up catalytic converter, bank 2 - efficiency below threshold
Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.
- TSB-13-15-001 - ENGINE AND ENGINE COOLING
MITSUBISHI: Due to variations in production, certain exhaust manifold mounted catalytic converters may experience catalyst layer separation on affected vehicles. If this occurs, the mil will illuminate with dtc P0421 or P0431, "warm up catalyst efficie - 115 - ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL
MITSUBISHI: Diagnostic trouble code (dtc) P0421 / dtc P0431. Mitsubishi tech talk. *tt - 10182004 - ELECTRICAL SYSTEM
DODGE: Added diagnostics for P0421 and P0431. *eh - 010203 - UNKNOWN OR OTHER
AUDI: Subject regarding malfunction indicator light (mil) on, diagnostic trouble codes P0421 or P0431 stored in memory. *tt
2006 JEEP WRANGLER with 57000.0 miles
2006 Jeep Wrangler sport less then 60,000 miles on it and keeps getting service code P0431 P0431-catalyst warm up efficiency below threshold all 4 oxygen sensors replaced and still getting code.
ENGINE AND ENGINE COOLING,
2001 MITSUBISHI GALANT with 13000.0 miles
Problem codes wrong with my car. P0431 P0174 P0176 or P0171 P0441 P0335 P0300.
ELECTRICAL SYSTEM, ELECTRONIC STABILITY CONTROL FUEL/PROPULSION SYSTEM