...155-159 Hz at sea level and drops about 3 Hz for every 1000 feet gained in altitude. The Powertrain Control Module (PCM) calculates the barometric pressure from the Mass Air Flow (MAF) sensor input ...
155, may be what Delco calls a 154, or NGK calls a 156. All of them have their own rating. Some are the same as OEM rating or real close. Some ARE NOT AT ALL CLOSE(Mentioning no BOSCH products! Oops..
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