tl:dr;
- P0330 on 2000 Lexus RX300 275k miles
- Replaced both knock sensors and wires
- Code went away for 50 miles
- Back now and comes back almost every time you drive it
- Tried Seafoam in the tank and spray into throttle body
- Still get P0330
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My dad's trying to sell his Lexus RX300. Bought new in 1999 it's a 2000 model year car, now sitting at 275K miles.
P0330 is Knock Sensor Circuit bank 2 malfunction. I replaced both knock sensors with new ones from RockAuto and I replaced the wire that goes to them.
Car drove fine for 50 miles, but then I started getting the P0300 again. Also, coolant leak at same time, I think I may have damaged one of the tubes going into the heater core when I did the knock sensor repair.
Leak is kinda slow, been topping it with water, there's no danger of freezing weather down here in Georgia at the moment.
After the P0330 came back I put a can of Seafoam in the gas tank (it's been running premium btw) and I tried the Seafoam spray stuff that you spray into the throttle body, used maybe ¾ of a can of it in there while my dad revved the engine. We let it sit a while then I went and drove it pretty hard for a few miles as recommended on the can.
P0330 keeps returning. Not sure what to do, as this will cause it to fail emissions thereby greatly impacting resale value.
Any ideas?