Helllo,

I bought an IS300 Sportcross a few months ago and inherited a few problems. I knew going in it needed a couple O2 sensors based on the check engine light. I decided to replace all 4 sensors with Denso sensors. After that, I received a check engine light telling me I had a bad cat (closest to the manifold). So I replaced the cats near the manifold with a direct fit product from Magnaflow. I still had a check engine light (P0150) stating something is wrong at bank 2 sensor 2. I thought maybe the sensor was bad, so I swapped it for a new one. The check engine light is back on (P0156) still telling me something is wrong at bank 2 sensor 2. What could possibly be the problem? I should also mention that the car does not have the original rear exhaust, it is an Apexi system. Is an O2 simulator my only hope since I do not have factory exhaust? Any help would be much appreciated.

 

did you try clearing the DTC's before key cycling?

 

No you would not need an O2 sensor for the exhaust. Ok so you bought a magnaflow OEM replacement header. When you replaced the header or sensors did you disconnect the battery?

 

I have cleared the codes numerous times, they continue to come back on bank 2 sensor 2.

The magnaflow system was installed by a mechanic I use. I am not sure if he did or not. However, when I installed the sensor on bank 2 this last time I disconnected the battery to clear the codes.

It is mind boggling that I continue to get CEL codes on that same sensor that has now been replaced twice.

 

Verify that the harness did not have a bent pins that might not be making contact. And if they cut and spliced the sensor, make sure they soldered and not used regular connectors.