CEL P1133 After o2 replacement

[Scotty_T]

99 4runner
sr5 4x4 Auto
3.4l V6

I replaced my front o2 sensor with DENSO 2344162 (234-4162) and now I have a CEL (p1133). The engine surges in low RPM's and my mileage went down the toilet. When I got the sensor the plug was different, same size and style but the raised ridged on the sides where in different spots so I repinned my old connector on to the new sensor, put all wires exactly where they were on the old plug. Only thing i can think is maybe I got the 2 black wires backwards (i doubt it but anything is possible) Any ideas what the hell is going on?

 

[Singtoe]

I think you put an H2O sensor on where it needs an AF sensor. Take it off and install the correct senor.


Just my opinion though.

 

[TheDurk]

What Singtoe said. You almost certainly have a Cali. emissions truck. '99 Cali.'s were sold all over the country, including my bought-in-NJ rig. Look underneath and see if you have two cats, or check your emissions label. Then go here to get the correct part number. Save the 234-4162 and use it when the rear one goes (P0420 or P0141)--it will work fine there.

The A/F sensors have a different plug to prevent people from doing exactly what you did.

Singtoe: "H2O" sensor??

 

[Scotty_T]

What Singtoe said. You almost certainly have a Cali. emissions truck. '99 Cali.'s were sold all over the country, including my bought-in-NJ rig. Look underneath and see if you have two cats, or check your emissions label. Then go here to get the correct part number. Save the 234-4162 and use it when the rear one goes (P0420 or P0141)--it will work fine there.

The A/F sensors have a different plug to prevent people from doing exactly what you did.

Singtoe: "H2O" sensor??

just went outside and layed under the truck, and damn, wrong o2....gotta spend twice as much now to get the right one, ****in' figures....

 

[Mudtallica]

Don't feel bad man.. I just went thru the same damn thing but I spent $3000 on new stuff tryin' to get rid of the surging.. I have no idea why they even sale front O2's for CA emissions T4R's of this model... You'd think somethin' would pop up & say "This part does not exist, try the A/F ratio sensor"... Lessons learned.. Glad you were able to catch it quick..

 

[TheDurk]

Don't feel bad man.. I just went thru the same damn thing but I spent $3000 on new stuff tryin' to get rid of the surging.. I have no idea why they even sale front O2's for CA emissions T4R's of this model... You'd think somethin' would pop up & say "This part does not exist, try the A/F ratio sensor"... Lessons learned.. Glad you were able to catch it quick..

Who sells a front O2 for a Cali. 4Runner?? Never seen it and it won't even plug in. Somewhere it says "exc. Cali.," I suspect. What does happen is you get drill-down listings that never ask you if it is a Cali. truck, but the item should specify.

 

[Scotty_T]

i knew it wasn't for a cali vehicle, just didn't realize mine was a cali vehicle...