Is this a normal pre Cat lambda trace?

[benkay]

Hi Guys,

I'm having a nightmare with an intermittent misfire. Have checked the usuals, injectors seem fine, HT leads intact, strong spark from the plugs (NGK) etc etc

I have an RSTuner and that had a logged Front O2 Sensor Fault. I cleared it and it hasn't come back yet (but the misfire hasn't since I reset it).

Due to the intermittency it's really hard to diagnose, but could a faulty O2 sensor cause the car to be undriveable? The misfire, when it happens, is awful and it's almost impossible to pull away from standstill. It happens under load, but also at stanstill.

Anyway, the sensor trace from RSTuner is below, I can't believe this is right but could an expert confirm my suspicions this is the likely cause of my troubles?

 

[Sean6545]

Yes looks fine. Should fluctuate from around 200mv to 800mv in closed loop.

 

[bmh.01]

Yes, as its a narrowband sensor. It can only determine rich or lean, not specifics.