Weird problem. Started this winter. The car is running really rich. My A/F meter would show extremely lean and my turbo timer would show 0.00v on coming from the o2 sensor. So I changed the o2 sensor. The car is still runing rich. But now the A/F shows extremely rich and I get ~1.70v from the o2 sensor.

I checked for CEL and here what I got.

1 Oxygen Sensor "A" (Primary)
Defective circuit or unplugged / defective sensor

16 Fuel Injection System
Defective circuit or unplugged / Defective fuel injector

18 Which doesn't exist according to the websites I seached on.

61 Oxygen Sensor, Heated - Sensor 1 (Primary)
High voltage, Low voltage, or slow response

So now, could it be my injectors that are bad, then its running so rich it cause the o2 sensor to be defective?

 

Check the voltages with a voltmeter from the O2 harness underneeth the car, 0 volts in the primary means your car was running in openloop, also check for your ground wires, i hd simmilar problems with my o2 before but i never got it fixed, i just connected the o2 singal from the ecu to the A/F wideband signal.. it seems that your car is running in open loop becuase it will make your car run really RICH in closed loop it would run 14.7-14.1 A/F or stocih.

Was it a brand new O2 that you replaced?
What air fuel gauge are you running?

 

No I raplced it with a used one. I have an autometer a/f gauge.