A student of mine has this BMW (323i 2.8 I6) with the P1188 & P1189 codes. STFT 1 & 2 are both at 28% and MAF is under 3 gps. I cannot locate any downstream air leaks from the MAF. Vehicle has 168K on the odometer. I want to condemn the MAF but am requesting a... Login to read more.