HELP! Flashing D4 light : 1998 Accord EX 2.3
I finished pulling a blown motor from my 1998 Accord, and installing a used motor. Upon completion, I started the car and immediately got a check engine light which I diagnosed as both O2 sensors. I cleared the codes, and restarted, but keep getting P0141 Rear O2 sensor. I ignored the light and went for a drive.
Almost immediately, the D4 light on the dash started flashing, and I was unable to shift from 2nd to 3rd gear. The car was running and driving fine beforehand.
What could be the problem???