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Q:

check engine light flashing fast on 1997 Subaru Legacy Outback

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The car will not turn over, but, the lights, radio and power windows still work. The fan will even run. I replaced the rear o2 sensor. no help.
(1) Answer
Start with a new battery a battery with one bad cell will power the lights radio etc but wont have the amps to engage the starter or power the ignition