What length 02 extensions do you need? 12" or 24". Thanks in advance.
You would need two of each! On an OBDII car you must have a set of upstream and downstream O2 sensors for each catalytic converter you have. Hence we have two banks and each bank has two sensors.bob_50 said:According to my install paperwork, it says 2 12" O2 extension (GTO) for the front and 1 24" flat O2 extension for the back(can't remember which side).
CMNTMXR57 said:You would need two of each! On an OBDII car you must have a set of upstream and downstream O2 sensors for each catalytic converter you have. Hence we have two banks and each bank has two sensors.
CMNTMXR57 said:Here's how the system works. You have two separate banks on this car which have/had two sensors in each bank from the factory. Each bank had one catalytic converter in which case there would be one pre-cat (upstream) and one post cat (downstream) on each. The only way GM would combine them in one post cat sensor is if both banks came to a "Y" right afterwords where both joined and became one. Since our cars do not do have this "Y" feature, there has to be 4 from the factory.
What it sounds like happened is that they (Speed Inc.) may have just needed three extensions to make it work because one of the factory harnesses had enough to go the added length, but rest assured, there is wiring for 4 O2 sensors.