I've noticed that the computer on my '03 is giving me bad MPG readings.....I't off between 5-6 MPG, Is this fixable? does a reboot of computer remedy?
Ask and ye shall receive:
Yes. The procedure is as follows (thanks to Paul Ford):
To adjust the MPG readout on the BC, do the following:
1) Divide the displayed MPG value by the actual MPG value, then multiply by 1000. For example, 48 MPG divided by 55 MPG = 0.872 x 1000 = 872. Remember this number. (Editor's note: You might want to run a few tanks through resetting the BC only on the first tank but measuring actual MPG by hand for each tank to get a good average.)
2) Press the reset and mode buttons on the BC simultaneously, then release. (Editor's note: do this with the ignition ON.) The BC will display '01'.
3) Use the BC button on the right hand control switch to scroll through the four test screens. Stop when '03' is displayed and then press the reset button. WARNING: Watch the screen carefully at this point! As soon as you press 'reset', look for the very first number displayed. This is the current MPG calibration factor but it's only displayed for a second before the number starts to count up. The OEM setting is usually 1000 (no calibration) but it might not be and you may wish to return to the original number if you're not happy with the results of this exercise. The number will begin to scroll, starting with the current setting, up to 1250. It will then begin again at 750 and continue up. When this number reaches the number closest to the number that you remembered from step 1), press the reset button again. That will reset the calibration factor for your display.
The other three test screens will not do anything.
Note this only works on 99-2004 BCs.