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2009 Nissan Frontier LE 2WD King Cab V6 Auto

2009 Nissan Frontier
Trim Info:
Rear Wheel Drive, King Cab
15 mpg city / 20 mpg hwy
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July 23, 2010, 7:02 am

Bryan B

Question: What side of vehical is bank 2 considered?

I have a trouble code and it says Catalyst signal to high bank 2. I changed both cats. I am assuming it is O2 sensors.

July 23, 2010, 6:13 pm

Ron W
Expert Mechanic

Number one cylinder should be on the passenger side, so bank two should be on the driver's side of the engine. If you list the code, I can tell you if it refers to the 02, but from your description, it sounds like it does.

1/1 users found this helpful.

July 28, 2010, 1:54 pm

Bryan B

The vehical was only giving one code but I rechecked it yesterday and I now have same codes I had before I change the Cats. P420 and P430. Which in the book states that its both Cats. How can this be. I have brand new Cats. A mechanic at the dealership told me to check the exhaust to see if I may have any exhaust leaks. Could this be a possibility? I don't know what else to check other than the sensors maybe.

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July 28, 2010, 5:27 pm

Ron W
Expert Mechanic

Please check for leaks. The way those codes are set is by the computer comparing the front O2 sensors information to the rear O2 sensors information. Basically it looks to see if they're doing the same thing (means the cat isn't doing anything) or if their cycling patterns are different (means the cat is doing something) If the front O2 are diluted with excess air, they won't cycle properly and can look similar to the rear O2 sensors' signals. When that happens the codes are set.

1/1 users found this helpful.

July 30, 2010, 11:09 am

Bryan B

Thanks Ronw you have been a tremendous help. It appears that there is an air leak at the flanges of where the exhaust bolts to Cats. The welds are cracked. I am gonna see about getting this welded and try clearing the codes again.

0/0 users found this helpful.

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