Quote:
Originally Posted by mpgmike
Not sure of a technical reason, but we used parts store sensors and fought with fuel economy gains. After way too many hours of frustration, we tried OEM O2 sensors as a last resort and -- what do you know? We got the gains!
Cheaper sensors will get rid of a DTC, and the ECU doesn't complain, when everything's stock. But even then, they don't seem to get quite as good fuel economy as the OEM sensors.
Best I can tell is it probably has something to do with calibration.
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I agree I think you have to watch out with aftermarket O2's sensors. I have a fake BOSCH WB that reads 14.7 all the time.
Also I'll add on my setup I run in open loop all the time for fuel economy. If I run it in closed loop I can't run my car very lean and get miss-firing. I think it has to do with the oscillation of closed loop.