I have a 99 Mercury Montaineer with fuel trim on both banks going a little high with RPM up. Not high enough to set a MIL. I noticed on my scan tool that the Baro PID reads 147.9 hz when it should read at about 155 hz at less than 1000 feet above sea level and my two resistors were dirty. Since the sensor is part of a housing which is riveted to it, I can only clean the hot wire but can't reach the cold wire behind it. Didn't help. I drove at WOT several times to update the Baro but remained the same at 147 range. Also the fuel trims were the same. I remember watching Paul's videos where he mentions that the computer can store other sensors position or readings in memory, disconnecting the battery can resolve the issue. In the repair manual for my truck it says to disconnect the battery with no specific reason as to why when replacing the sensor. Is the MAF set in memory? Thanks.
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