Air Flow Meter - MAF - JZX110 - Genuine DensoAirflow meter MAF AFM for the JZX110 and Toyota Crown JZS171 Both of these cars DO NOT use the same MAF as the JZX100. This is a genuine Denso item so replaces the factory sensor perfectly which is also made by Denso. When the sensor becomes faulty the air fuel ratio becomes dangerously lean and as the sensor is reporting low airflow to the ecu ignition timing is advanced too far for the real load the engine is experiencing so detonation occurs.