I have a 2001 1.8 t. It has started idling and running rough. I pulled up 9 codes P1421 P1425 P1426 P1427 P1428 p0300 p0302 & p0303. Any ideas why so many codes and what the problem(s) might be?
Best case scenario, you've got some popped fuses, and you can just replace those. Worst case, you'll have to replace the harness. Not a tough job, but time consuming, and honestly a little daunting.
2000 Beetle, 1991 CR-X, 2005 Chevy Malibu 3.5 LS, 1988 F-150 (R.I.P)