Car has a P1351 code, not sure what it is. Timing belt was done a year ago by the previous owner, and it is only the P1351 code, NOT the P1354 code that usually goes along with it. The car also has misfire codes that come and go randomly, but I have a feeling that is due to the spark plugs since I am pretty sure they were only changed once in the cars 200k miles, so that might be unrelated. Where should I start in fixing this?

 

Have you looked at this:
https://www.clublexus.com/forums/ls-...4-and-vsc.html

 

Yeah, but I don't have those symptoms. I only have the P1351 code, not the 1354, and my car runs smooth as day, unlike what that poster described. The VSC does come on when the check engine light comes on. Does this mean it could be a dirty or bad oil control valve?

 

just change your oil control valve, its a ~$30 part.

my car was randomly misfiring and throwing a vvt malfunction code and changing the ocv got rid of those codes.

 

if you want to fix your Lexus, quit stalling and clean or replace the valves

https://www.clublexus.com/forums/ls-1...4-and-vsc.html

 

I posted on the wrong thread. It's the timing belt or the ECM.

 

or.......oil control valve.. cheapest fix

 

The factory manual lists the oil control valve as a possible culprit in a p1349. It doesn't list it for a P1351.