Do you know anyone local that has a OBD dongle that can read out the codes via a phone app i.e Torque Pro.
The CEL could point you to the failure i.e MAF, but the CEL may also flag if something more fundamental mechanically has failed i.e piston failure causing a Misfire which the ECU will log a Misfire count against.
01/02 WRX do like to log misfire related CEL's due to the poorley set low tolerance level in the ECU.
Does the CEL clear if you turn the ignition on/of 5 times without starting i.e fully on but don't crank, fully off (I think 5 time clears some CEL's but maybe it's 3 times)
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