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I finaly installed my obd port and took it to autozone . this is what the gave me. po135 and po102 . i did replaced the map sensor with a spare that i had before i go and spend on a new mass airflow. the blazer's gas milage has been bad lately,oh and it smells of fuel . maybe you guys can tell me something that will work. thanks
Well, the PO135 is saying the driver's side upstream O2 sensor is bad--so just replace it. And the PO102 is saying the MAF has low frequency. You can take a voltmeter and check to see if you have between 4 and 6 volts. If not, the wiring is bad somewhere--at the connector, in the wire loom, etc. Try looking at the connector to see if the pins are properly seated.
Sometimes 102 is caused when someone checks the air filter and does not plug the MAF back in.
Kinda need to know what vehicle you're working on.