The digits indicate whether or not the sensor heater is working and whether or not the oxygen sensor control is operational and active. Field 1 is a three-digit binary code which gives the status of the pre-cat oxygen sensor. If it's lower than 1 g/s, then there is probably a leak in the intake tubing between the MAF and manifold.Ģ. The value at idle should be between 1 and 25 g/s. Make sure the car is running and warmed up and the A/C is off. The info below is from the MKIV Bentley CD.ġ. Here are a few VAG-COM tests you can do to help determine which one is at fault. The procedure is used to test the MAF and the pre-cat oxygen sensor.Ĭode 17536 or P1128 will in most cases be due to either a bad MAF or pre-cat oxygen sensor or a leak in the intake between the MAF and the manifold. I put the procedure in the main VR6/2.0 MAF thread (page 6) this morning, so I'll copy it here also. Re: How to use VAG-COM to test MAF? (jackr)
