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  #101  
Old 02-25-2010, 03:01 PM
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Originally Posted by corsair23 View Post
It seems though that it is almost prudent to replace both the cats and the O2 sensors together though if there is a chance a bad O2 sensor will burn out a cat...
And vice versa, a poorly running engine can ruin the O2. When I built the new engine I used an old O2 at break-in because I assumed all that burning assembly lube and crap would foul it. That seemed to be the case because it threw the code not long after, but that was an experiment and so I had the new one to put in.

BTW, http://www.sparkplugs.com sells Denso O2 sensors with the proper plug for a lot cheaper than Toyota. Dunno if that's well known or not.
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  #102  
Old 02-25-2010, 03:48 PM
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Its my understanding that the sensor in front of the cat is the one controlling the mixture in the engine. The one after the cat is monitoring cat function. If you were to do a prophylactic sensor replacement, the front one ought to do it.
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  #103  
Old 02-25-2010, 03:52 PM
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It might be off track but not really....you can't possibly talk about older trucks now failing emissions due to new standards in place they they were not ever designed to meet without bringing up politics....
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  #104  
Old 02-25-2010, 03:53 PM
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Originally Posted by 60wag View Post
Its my understanding that the sensor in front of the cat is the one controlling the mixture in the engine. The one after the cat is monitoring cat function. If you were to do a prophylactic sensor replacement, the front one ought to do it.
Yep, that's my understanding as well..

Also, you can try to clean a contaminated o2 sensor by heating it up with a torch.. I have never tried it, but i've read about it.
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  #105  
Old 02-25-2010, 04:10 PM
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Originally Posted by DaveInDenver View Post
BTW, http://www.sparkplugs.com sells Denso O2 sensors with the proper plug for a lot cheaper than Toyota. Dunno if that's well known or not.
+1!
Not sure these days but they even beat the Rising Sun discount when I needed them.
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  #106  
Old 02-25-2010, 04:13 PM
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Now this is interesting... different O2 for auto and manual trans?? (1997 5VZ-FE 4Runner)
Denso OE identical O2 sensor 234-4162 234-4162 FRONT Automatic Transmission Sale: $76.12
Denso OE identical O2 sensor 234-4161 234-4161 FRONT Manual Transmission $93.21

And about $15 cheaper if you don't mind splicing wires. Hmmm.
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  #107  
Old 02-25-2010, 05:01 PM
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Quote:
Originally Posted by Red_Chili View Post
Now this is interesting... different O2 for auto and manual trans?? (1997 5VZ-FE 4Runner)
Denso OE identical O2 sensor 234-4162 234-4162 FRONT Automatic Transmission Sale: $76.12
Denso OE identical O2 sensor 234-4161 234-4161 FRONT Manual Transmission $93.21

And about $15 cheaper if you don't mind splicing wires. Hmmm.

Carefull Bill, the resistance values are different between the auto and manual. One is 7ohms and the other is 13ohms. The difference is enough to set a oxygen sensor heater circut malfunction code. Ask me how I know
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  #108  
Old 03-01-2010, 08:34 AM
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So get this- I get to the Broomfield Air Care place, I'm 3 deep in line. 25 minutes later they're still messing with the first truck.. then the gal comes in to say sorry folks, the all wheel drive rollers are broken. Here's the number you can call us later this afternoon to see if we've got them fixed, or here's a map to a different location.


edit: I pulled a 10 sticker off of our Prius' old plate, so in the interim at least my license plate appears to be current.
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  #109  
Old 03-01-2010, 08:40 AM
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then the gal comes in to say sorry folks, the all wheel drive rollers are broken.
What a pain in the a**!
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  #110  
Old 03-01-2010, 10:35 AM
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What a pain in the a**!
rrrrrrrrrrrrr X2...
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