Join Date: Sep 2006
Location: Mechanicsburg, PA
Feedback Score: 8 reviews
The difference between both part numbers, is that one supersedes the other. Acura/Honda updated it. The old part number is no longer used
Are all four injectors leaking? If all four are leaking/faulty, then yes, you replace all of them. If only one is leaking, then you replace one of them. If two are leaking, you'd replace two of them. (see the pattern here?)
Yes, if the o-ring is cracked, warped, torn, or otherwise not perfect, then it's bad.
You have four injectors. You'll need four o-rings, and four cushion seats. (again, only if you're replacing all of them)