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Old 03-13-2009, 05:14 PM
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Default o2/maf

ok - so this may be a "duh" to most, but just a reminder for older obd vehicles. O2's don't always through a code. I bought this t100 used of course, and one of the reasons was that the PO did just about every PM thing known to man. Since buying the truck though, my mpg just kept going down where it finally stopped at 13.5 or so combined city/highway....

I pulled codes, and nothing there.. So, I went through the documentation of what he had replaced, and low and behold, no O2 replacement. I promptly replaced them and cleaned the MAF.

They were caked, and rightly so, at 168k miles. Average life on an O2 is around 120k, so there you go.

mpg is now back up to a respectable 18.2 combined..

I was running in limp mode it turns out, at full rich.

j
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Old 03-13-2009, 07:11 PM
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Wow, great upgrade. Were these the O2 sensors in the exhaust system? Are there others?
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Old 03-13-2009, 07:59 PM
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Not to sound like a moron here, but what is an MAF? Mass Airflow Sensor?
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Old 03-16-2009, 08:55 AM
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yeah - mass air flow..

o2's on the 3.4 are pre and post cat. Held in by flange bolts, and take like 10 minutes. NEVER buy generic. Either buy direct fit replacement by bosch or the oem toyota. Bosch makes most of the oem anyway.
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Old 03-16-2009, 09:44 AM
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Friends do not let friends do Bosch. They can really cause issues.
OEM are ND or NGK, available at sparkplugs.com.

Hey, and thanks for the reminder, I need to replace my O2 on the '93 DD! 153K miles. Yeah, I procrastinate...
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Old 03-16-2009, 10:19 AM
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bosch universals do. direct fits don't
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Old 03-16-2009, 12:47 PM
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whats the difference in a universal O2 sensor and a direct fit??
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Old 03-16-2009, 01:42 PM
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universals are splice in, direct fit matches oem connector.
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Old 03-16-2009, 04:56 PM
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I realize that, but everybody here is saying not to go with universal.. why not? just because they are splice in?
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Old 03-16-2009, 05:09 PM
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I have never been satisfied, nor had a universal o2 last on the simpler systems. Whether it's the resistance range not matching, or the durability, one or the other has bitten me.

I have never even tried to run a obd generic o2 sensor, and I wouldn't.
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