 This truck has been a lemon since the day I bought it.The knock sensor and the catalytic converters (yes, plural) go bad at 100k miles, and you're looking at 3k to fix all this, or else you can't pass emissions.I've talked to mechanics and they say that they see this all the time with Nissan frontiers.You'll need to get the Nissan parts, because aftermarket parts aren't compatible and you'll waste your money, & still not pass emissions.The AC has gone out on me twice, and even the electrical components struggle.I've only got 145k highway miles, and I've struggled mightily with the catalytic converters, knock sensors, AC unit (broken twice), electrical, tailgate handle, door handle