Emissions Inspection andMaintenance Programs Some local governments may have programs to inspect the on-vehicle emission control equipment. For the inspection, the emission system teste quipment is connected to the vehicle’s Data Link Connector (DLC). The DLC is under the instrument panel to the left of the steering wheel. See your dealer if assistance is needed.
...in this illustration, it's part of wiring cable item #1, the connector on the far right side, just left of item #2:
Knee pads is the only tool I can think of, but that is optional, its right there under the lower left dash panel in plain site. Not sure what good it will do you, my OBD II scanner wouldn't pick up the C0504 steering code. Dealer has all brand new stuff, told me even his GM Tech II scanner is worthless.
Have no reason to doubt him. change this stuff every year.
What some probably are not realizing is, how lucky you & I are, but my DLC was actually not where it was supposed to be... took it to the dealership & they found my cars DLC tucked way up in dash & it had to pulled back into the holder. See thread labeled Torque... for more info. & pics.
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That's where it's kept from the time it's installed in the car to the time the underdash mount is installed. Apparently someone didn't pull it down after installing the undermount dash.