What about me??? :sad:

Good stuff. Take it back and tell them they f'ed it up and they need to fix it.

 

Primary O2 is on the exhaust manifold on my '99. Should be in the same area on yours. Follow wires to plug and then to harness. Make sure wires are plugged in/not broken. I think I remember that the old O2 sensor plugs (had '91 CRX) were kinda flimsy. The shop may have pushed a contact out of the plug. O2 sensor is not as fragile as the automotive industry would have you believe. Your car is also running full rich right now. This will cause you more O2 sensor problems.

 

Your O2 sensor has a built-in heater, it'll be the 2 same-colored wires (probably black) on the sensor. Maybe they're unplugged like people have said?

Measure the resistance between them. It should be 15 to 40 ohms & there should not be any continuity to ground from either one. If that's OK then check the wiring around there for cuts or something.

 

Took my honda back today to have it looked at, I told them to check the wiring on the O2 sensor. Guess what? they found a bent wire on the O2 sensor connection. This was causing a bad connection and the check engine light to come on. They did not charge me as this was something they did when they removed the exhaust to replaced the oil pan. Thanks for all the advice you guys saved me some money on this deal.

 

glad we could help