It is a 1990 Civic DX (1.5l) 5MT with 180,000 miles. I believe this model has the OBD-1, but I am not certain. When I replaced the 02 sensor, I only pulled the ECU fuse for about 30 seconds. Does it need to be removed for a longer time periord (10min...30min)?

The car seems to run good. The Honda dealership said that the first cylinder only has 90% compression, but other than that, it does not seem to have any engine troubles.

The Bosch replacement sensor has only one wire and I followed the basic directions.

Any suggestions?