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Unread 08-18-2018, 06:34 PM   #1
expat
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Default Fuel/air ratio sensor (Not an 02sensor)

Need to change the air/fuel ratio sensor on Sams 04 4.0ltr engine. Iíve read that on the 4.0 the upstream are air/fuel sensor, NOT oxygen sensors. Most threads I read elsewhere, people had to go to Toyota for an original part that was $200 for 1!

What about this as an alternative?

https://shop.advanceautoparts.com/p/...applications-d
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Unread 09-15-2018, 07:48 PM   #2
Dealmaker
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Mark, I've replaced two sensors so far on my 4th gens, but can't remember if they were just O2, or fuel/air sensors..
Bought both on Amazon, believe it or not!
Both were Denso's, which I believe is factory.
I paid much less than $100 and replaced them my self.
Toyota dealer wanted like 375-400 and it ended up costing me like $70-ish and 15 minutes.
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Unread 09-26-2018, 05:12 PM   #3
expat
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Thx bud. I changed the sensors and now its complaining about the catalytic converters. F'n trucks!

Gotta get it to an exhaust shop so they can temp test the cats to see if they are truly failing or whether I can run some CatKleen thru the system just so I can get rid of the code and get the damn truck smogged!
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Unread 10-18-2018, 08:49 AM   #4
tomcat144d
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Default Similar issue

Hey brother 1 question what were symptoms of the failing o2 sensors? Voltage change performance gas mileage? I having issues now too cats temp good no strange smell but truck keeps stalling at lights ideals low 399 to 500 in park and drive. I did replace mass air fuel but to no avail. Through codes p2238 and p2241 b2 b1 sensor1 on both but voltages are right on spec and as acceleration the move pretty closely to gether. luckily this is a non smog year for me check this link out. A penny for your thoughts.

http://www.toyota120.com/forum/showthread.php?t=3070

Helped me out a lot!
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Unread 10-18-2018, 01:58 PM   #5
expat
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No symptoms other than error codes. I didn’t measure their values. I just pulled them and replaced them.

The P0430 code indicates bad catalytic converters. I had my son run the CatKleen liquid thru the gas tank. He said he cleared the codes and they haven’t come back in two weeks. If that is the case I’m getting it to smog ASAP.
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Unread 10-18-2018, 06:07 PM   #6
tomcat144d
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Talking Nice! Smog it fast

Nice I've been banging my head against the wall for a week codes come then fall off every things fine then vsc trac and lights hit again then od2 codes start flying p0430 p0420 then o2 sensors bank 1,2 sensor 1 then a wheel speed sensor code pops turned off truck went to bed woke up next day no codes at all car drove fine. Smog it fast! Best wishes.
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