I'm getting a 0303 code from the ECU on my 96 max (auto). I know it's a o2 sensor and the decoder says "Left Front heated o2 sensor". Trying to search, I only come up with bank 1 & 2. Can someone tell me what bank is left or right. I guess the easiest way to determine this would be radiator or firewall.

Sorry if this has been asked a million times. I did try searching but couldn't find a direct answer.

TIA.

 

http://forums.maxima.org/6432120-post1.html

 

Thanks! That clears things up.

 

Front wheel drive cars confuse the definitions of left and right because the engine is mounted sideways. Then there are the multiple terms for the same thing.

Left side = bank 2 = firewall side.
Right side = bank 1 = radiator side.

Front sensor = sensor 1 = S1 = upstream sensor = sensor mounted in the exhaust manifold.

Rear sensor = sensor 2 = S2 = downstream sensor = sensor mounted in the exhaust y-pipe after the manifold (Cali spec) or after the main cat (Fed spec).