Air/Fuel Ratio Sensor replacement

I've got the code P0051 (H02S Heater Control Bank 2 Sensor 1) which is the upstream drivers side sensor. It's a $&@* to get at. Has anybody done this and found the easiest way to get it? I might have to take the manifold stay off to get room to get it out with a 22mm crowsfoot and a short flex head breaker bar. I'm worried if I take the manifold stay off I could damage the exhaust manifold with how hard I'll have to pull on it. I doesn't look like I'll be able to go at it from the top...Also, would it be best to heat it with a torch or run the exhaust hot and try to work fast with gloves on? It's not easy even getting the crowsfoot on it.

 

this one?

 

disregard............

I never took mine off the stock manifolds.

think thats tight? dont attempt headers


not 100% sure where yours lines up on stockers, sorry

 

It's the one closest to the motor on the drivers side. I used a 22mm crow foot and a short flex head breaker bar (couldn't use a ratchet because there wasn't enough clearance between the crowsfoot and the sensor). I disconnected the front end of the front driveshaft and that gave me enough room to get it off. It actually came off easier than I thought it would. The exhaust was still a little warm but not hot. I decided to keep the manifold stay on because I didn't want to damage the manifold (2005 with 200,000 kms and the studs into the head didn't look like something I'd want to play with if I damaged the manifold). I'm glad my 1/2" set of crowsfoot is 12point style. I had to switch it from one side to the other to have enough swing then I used a 22mm stubby wrench then got it by hand.

So to anybody that has to do it, just disconnect the front of the front drive shaft and move it towards the centre of the truck. The passenger side looks like it has a lot of room and the downstream sensors are super easy to get at.

 

I know this is an old thread, but thanks for the write up. I have the same code so I looked at that sensor today... not a easy swap. By the time I buy the 22mm crowfoot and a 22mm stubby wrench, it may be cheaper to just pay my mechanic to do this one for me lol.

 

This is how I did mine. I got the check engine light and then OBD scanned. The code was P0051, upstream bank two (drivers side, left).

I ordered a 22mm offset O2 sensor removal tool with slot from Amazon for $10. I probably could have borrowed a loaner tool from the auto parts place. I soaked the sensor base with PB Blaster each night for a few days. From underneath I was able to get the O2 tool on over the wire, connect a 3/8 drive ratchet and then a 3/4 pipe for an extension. The A/F sensor popped loose on the first try, no heating, no need to drop driveshaft, no stubby tool needed. Space is tight but it worked.

I disconnected the electrical connector from the top of the engine. It was tricky but it finally popped off. I ordered the new sensor (

$131 234-9067 Air Fuel Sensor

234-9067) from Rock Auto. They had the best price.

As an FYI, this is 2009 Tacoma TRD AC with 210k miles and rusty from Upstate NY commuting. I hope this helps someone.

 

$12 ARES 70039-3/8" Drive by 7/8" (22mm) Offset Oxygen Sensor Socket - Wire Gate Accesses Sensor from Side, Preventing Damage to Wires

https://www.amazon.com/ARES-70039-3...6&sr=1-1-72d6bf18-a4db-4490-a794-9cd9552ac58d