Originally Posted By: PandaBear
Originally Posted By: garlicbreadman
Did you notice an immediate gain in MPG once changed? Which one did you like better?
I didn't notice immediate gain in MPG, they weren't bad when I first replaced them at 150k, just preventive as my smog was near failing. I used a Walker generic which was a rebadge Denso and I spliced my own wires.
At 254k miles, I replaced my oil pan gasket so I looked at the Denso, they were covered with white stuff because of my head gasket leak (another story, already fixed), so I replaced it with a NTK rockauto closeout. The car stumbled for a while because I didn't reset the ECU correctly (just pulled ECU fuse) or I didn't clean the IACV correctly and left puddle of cleaning fluid inside. Then I reseted it again by disconnecting the battery terminals for hours and this time it finally did the trick of resetting the ECU. My guess is the last sensor got so contaminated that the ECU enrich or lean out the mixture so much, a new sensor wouldn't match the setting anymore.
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I think I might choose Denso because the sensor seems to be bigger and there was a drop in emission reading after the change (2 years later) compare to the past. The NTK one seems to keep the same number if not worse (high nox but low co and hc, which means lean burn) after the change and a head gasket leak, so I'm not able to conclude that it is the new sensor or other components worn out during the leak (i.e. the cat).
If I have to take a chance I'd feel more comfortable with Denso in this case.
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But since I'm not testing the 2 sensors back to back I don't know which one is really better. I'd just pick the cheaper one between the 2.
thanks for the info. I bought the Denso off rockauto for 38 shipped. NTK was 28 shipped. I chose the denso after reading amazon reviews saying that is looks exactly like the oem oxygen. Go figure, it does say the denso unit is the oem replacement.