2001 GMC Safari Van
Where is OBD Bulb located? PO102 Mass
Air Flow Sensor low circuit how to fix?
PO404 EGR A Control Circuit Range how
to fix? What would cause OBD11
monitors not ready?
The P0102 is most likely the wiring going to the Mass Airflow Sensor. Sounds like you have a bad connection. If you have an aftermarket air filter, such as a K&N the oil for the air filter will contaminate the MAF. Or the MAF may be bad. The P0404 code is a pain in the neck one. Try this, in this order unplug the EGR valve, clear the computer with a scan tool. Turn off the ignition and disconnect the scan tool. Now plug the EGR valve back in and start the engine. This will allow the computer to learn the closed position of the EGR valve. Unfortunately if this doesn't work you'll have to get the computer flashed (reprogrammed). Yes, these things will prevent the readiness monitors from setting. You'll also need to drive a few days with the gas tank between 3/4 and 1/4 full to set the readiness monitors. You can pass inspection with 1, but only 1, readiness monitors not set under Federal Law. I literally just took my '00 Pontiac Grand Prix through inspection yesterday under the same condition. I repaired a misfire code and cleared the computer. Then drove the car for about 2 hours. All the readiness monitors had reset except for the EVAP System and I passed inspection. HTH. -Jim
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