2001 Oldsmobile Silhouette

Engine Mechanical problem
2001 Oldsmobile Silhouette 6 cyl Two Wheel Drive Automatic 90000 miles

What is the name of the sensor behind the mass airflow sensor? I had a smog check which failed visual inspection. The tube that connected the sensor behind the mass air flow sensor was loose. It goes underneath-benind the egr valve.

What is this sensor's name and where do I 'reconnect' it? I don't have a good line-of-sight.
March 18, 2009.

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