hello again, i recently had my check engine light come on. i took it to auto zone for the "obd" scanner tool. now that i got the codes(2 total),i don't know what they might be indicating?kinda but not specifically...so any help??? the first: p1148 fuel/air mass metering. second: p0328 knock sensor(bank 1 sensor 1)?
should this be taken to the dealer?
2003 Nissan X, 4wd,52,000ml.

thanks for the help

o-yeah i got my new bilsteins and installed them with no hitches... they sure are a nice difference. they handle those f-up city streets much better than the stock guys that where on there