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Ignition coil & air/fuel ratio sensor
My question is threefold:
1) How critical are these systems? My guess is both are critical, I just want to check with the amatexperts.
2) Is ~$670 a decent price for parts and labor for both fixes? That seems a bit on the high side (~430 parts, ~240 labor?)
3) Could either of these have been caused/aggravated by replacing a battery? (i.e. could they have been damaged in the battery install, or would a new battery cause these to fail anyways.) In other words, can I blame this on somebody else?
Any advice is much appreciated, and thanks!