The catalyst purge system (SAP - secondary air pump) is an auxiliary environmental system in the vehicle that cleans the catalyst from combustion product particles by injecting additional air into the engine’s exhaust system.
This system is designed to extend the lifespan of catalysts, but it often becomes the cause of critical engine errors. When the SAP malfunctions, the vehicle significantly loses power, consumes more fuel, and if the system fails completely, the engine enters emergency mode.
It is important to understand the consequences of a popular practice among some technicians of installing a "bypass" in the SAP circuit. Although this measure may "help" temporarily, it is based on incorrect engine ECU operation and will inevitably lead to premature failure of the catalyst and front lambda sensor.
Software disabling of the SAP error (error mask removal) is also a kind of deception of the engine control unit. After this procedure, the car will not display an error, but it also will not "run" properly with a faulty exhaust system.
The only correct way to fix the consequences of SAP system failure is to recalibrate the engine control tables and completely disable this system via software.
Specialists at ISTOCHNIK MOSHNOSTI studio are capable of disabling catalyst purging while considering all the specifics of each vehicle’s system.
