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Yeah, it wasn't the MAF sensor. My Matrix had been modified by the previous owner. He had installed a wideband O2 sensor in it to play around with it (with narrowband simulation). In order to fake the ECU into thinking that the original sensor was still in it, he added resistors into the O2 heating circuit to simulate the sensor to avoid the ecu detecting something wrong. Unfortunately, he didn't solder these connections and they began to come apart. I don't know exactly why this gave me a MAF code, but after I replaced the wideband with the OEM sensor again all was fine. Unfortunately, I had already replaced the maf sensor which wasn't too cheap.
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