Quote:
Originally Posted by throttlemeister
It also puts the ECU in emergency mode which results in an AFR of around 12:1, which negates the reason for installing any device in the first place.
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You're right about the ECU entering limp mode but my Wideband O2 measurements show that the BMW/Bosch limp mode actually shifts the fueling several percent leaner then several percent richer than stock from about 14:1 to 15.4:1. The reason is to bracket the operating range of the cat.