4runner revving and lurching.

[BoomSticks]

O2 sensor can also pop that code, because ultimately that sensor is what actually reads the rich or lean composition of the exhaust.

Anyone trying to diagnose these kinds of problems really needs a OBDII reader that does live data. ELM327 + Torque is the cheapest and one of the best options.

Watch the MAF numbers. Are they appropriate at idle, and then increase appropriately with throttle?

Does the #1 O2 sensor switch voltages appropriately? Is the average of the graph's highs and lows biased rich or lean?

http://www.aa1car.com/library/o2sensor.htm

 

[gamefreakgc]

O2 sensor can also pop that code, because ultimately that sensor is what actually reads the rich or lean composition of the exhaust.

Anyone trying to diagnose these kinds of problems really needs a OBDII reader that does live data. ELM327 + Torque is the cheapest and one of the best options.

Watch the MAF numbers. Are they appropriate at idle, and then increase appropriately with throttle?

Does the #1 O2 sensor switch voltages appropriately? Is the average of the graph's highs and lows biased rich or lean?

OXYGEN SENSORS

Or an old school analog voltmeter hooked up to the diagnostic ports! I forget which one it is, but that's how you did it on pre-OBDII vehicles.

 

[BoomSticks]

I believe you can get one for 46 bucks on Amazon, the denso one.

Now $44ish. For non-kali trucks it's https://www.amazon.com/dp/B000C5UFK8

 

[TheDurk]

Now $44ish. For non-kali trucks it's https://www.amazon.com/dp/B000C5UFK8

Not good info. There are a lot of p/n's, depending on year, front/rear, 2wd/4wd, auto/manual, 4cyl/V6, as well as Fed/Cali. The full list here:

Oxygen / AFR Sensors - Underdog Racing Development

You don't have to buy from them--Amazon usually has the best price, but URD is the best source for the Denso p/n's. Amazon is hit or miss. Denso's site is hard to use.

I think you should edit that post before someone buys the wrong sensor.