O2 Sensor Part 3...

[Melchor]

'99 UZJ100 w/ 78000+ miles

Hello forum... this is the 3rd posting re. O2 sensor. Here's the sit: I had the O2 sensors (Bank 2, sensor 1 & 2) replaced by a local independent import/domestic garage. After a day, the "Check Engine Light" came on again. So, I threw in the code reader and got the same P0155 (Bank 2 sensor 1). Did the mechanic miss anything? Should I get it check by Toyota-only tech? Thank you again... :

 

[cruisermaine]

I had this problem and it turned out to be an exhaust manifold crack -do a search for cracked exhaust manifold to find posts. Hope that is not your problem. Does the motor make a ticking sound when starting cold that seems to go away after it warms to operatiing temp?

 

[LonghornCruiser]

Sometimes this is caused by the mechanic not resetting the computer. It keeps the code in memory until the computer is reset. On a lot of cars you can reset the computer if you just disconnect the negative batt cable for a couple of minutes. Might be something to try before you spend any more money.

 

[jahmaka]

Sometime if the problem is fix you don't have to reset the ecu,just drive for about 15 mins and it should reset itself.