New O2 Sensor, Fantastic Mileage, then down the shitter again - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Anto · 12-10-2007, 10:43 PM

I recently installed a new OEM fit Denso oxygen sensor.
I pulled out my old one & discovered that the ceramic element had shattered and the car was running very rich.
Previously, I got 20-23 MPG, and since the install of the new o2 sensor, my MPG shot up to 28.

It stayed like that for about 300 miles, then went back down again. My driving habit has not changed since the new sensor.
WHAT THE HELL.

Any ideas?

12-10-2007, 10:43 PM	#1
Anto Zilvia Addict Join Date: Jan 2006 Location: California Posts: 862 Trader Rating: (2) Feedback Score: 2 reviews	New O2 Sensor, Fantastic Mileage, then down the shitter again I recently installed a new OEM fit Denso oxygen sensor. I pulled out my old one & discovered that the ceramic element had shattered and the car was running very rich. Previously, I got 20-23 MPG, and since the install of the new o2 sensor, my MPG shot up to 28. It stayed like that for about 300 miles, then went back down again. My driving habit has not changed since the new sensor. WHAT THE HELL. Any ideas?