I know all about Seafoam, Lucas, and etc. There is a reason that the owner's manual says not to use any kind of additives. The code was a p0430 which is bank 2 catalytic converter is below threshold. Everything that I am reading is saying the knock sensor is the main culprit. The o2 sensors were replaced when the manifold were replaced. All with OEM sensors which are Bosch. The knock sensor code didn't show up for me because it won't show up on a generic scanner. The knock sensor is the easiest and cheapest fix so I think I am going to start there. BTW I've never had a Nissan service center tell me to put additives in but the Ford service center did and I told him the owner's manual says not to. He wanted to argue with me about it so I got my manual and showed him. I've never been back. Oh back pressure tested fine.
2005 Nissan Titan LE Gas Knock Sensor
I have a 2005 Nissan Titan LE Gas w/ 197,000 miles throwing a Bank 2 knock sensor code and a cat below threshold on bank 2. I had the exhaust manifolds replaced last year w/ Dormans. So I really don't think that the cats are stopped up. Could the knock sensor be causing the cat code? First time I took it to the shop they said cat 1 and cat 2 where below threshold (i knew cat 2 was throwing the code that was the reason for it to go to the shop but that was the first time cat 1 threw a code) and the knock sensor code but the found a loose pcv hose and tightened it up, cleared the codes, watched everything and it seemed fine. Well I picked it up and drove 17 miles. Bam light back on so I took it back to the shop now they are saying all 4 o2 sensors are bad and of course the knock sensor also. Both times they said run seafoam and it should be fine. I don't know about that. Opinions?
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