Jesse729

Ok so chain of events.

Buy after market Y-pipe (currently in the mail)
Take car to crack muffler shop to get bolts on the cat heated off
Next day i get codes 0510 (downstream o2 maximum voltage monitor fault and 0304 (knock sensor) related?
Buy knock sensor (in the mail)
Look at O2 sensor noticed the ground is falling off from rust meaning the outer casing has separated opposite the actual sensor which goes in the exhaust
Fix O2 but actually break, code goes away and then 3 come back 0304 0510 and 0902 (o2 circuit fault)

Questions:
I've been wondering what the symptoms of a bad knock sensor are? The car seems to pull hard till 3500rpms then the power seems not to increase anymore. It's been like that for a while thought it just needed a Y-pipe but now that i think about it it seems to have lost power.

Are 0510 and 0304 related to each other and or bad coil packs?

The car is running great but there still could be a minor coil pack problem or it could all be in my head.

In your opinion if I replace the O2 and knock sensor will everything be ok?
I don't have the tools to check the coil packs

Jono98max

i am actually having the 05-10 code come up too. i'm getting the o2 sensor replaced this week so I am hoping that will take care of it.

if you haven't replaced the knock sensor yet, you prolly should replace it. thats just my opinion since the code is going on. I replaced mine when i got the code.

after you do those two replacements and you are still getting the coil pack problem, then it might be worthwhile checking those coilpacks checked out but I do know that they are known to be of poor quality on 99's.

99BlackMaxMS

iTrader: (85)

Fix everything but the KS then reset the ECU. Drive 100 miles and if 0304 is still there then change it. 0304 is thrown alot with other codes and goes away when you fix them.