Guys - I have a 92 SC400 and I wondering if anyone had some words of wisdom regarding the replacement of my O2 Sensors. My ECU codes were 21 and 28 so I assume that is the front O2 sensors (before the cats). I am also looking at AutoZone’s website and notice that it appears to have a few different options for the sensors that vary in price from $55.99 to $123.00.

Does anyone have any recommendations for brands, types, and or websites I can order replacement sensors from?

Thanks!!

 

I replaced both front O2s with DENSO Part #234-4211, I also disconnected my battery for about 10 minutes to reset the computer. My CEL is still intermitently coming on, so I just pulled the codes and I am still getting 21 & 28. Any ideas?

 

OK...here is an update to this problem. The CEL continues to intermitently come on and I am running out of ideas here. This weekend I replaced the EGR valve and my problem still persists. Anyone have any other suggestions?

 

weird. Are you getting bad gas mileage or is it on par?

 

No, I don't think so. I still get about 21 for city driving. That is why I thought it might be running lean and not rich so I replaced the EGR valve.

I talked to a mechanic yesterday that seemed to think it was the mass air sensor. I am not sure I buy that given the light comes on intermitently.