My wife’s X300 has been running pretty trouble free for the last few years. I even got rid of the dreaded secondary air issue (damaged connector pins at pump). Up to 275k miles now.
Recently she has complainted about the car seeming to want to stall at red lights and indeed it did a few days ago. Also the transmission warning light has come on a few times while driving although I don’t believe the LHM was active.
I put a can of fuel cleaner in 2 days ago and drove the car extensively. I had no issues although I did think it missed a couple of times at mid range. The idle seems to fluctuate and has been a little low at 700rpm.
I plan on checking the air filter/MAF/Throttle body/Plugs/Coils etc. first. It does have a new OEM CPS on it which did not impact it. There are no codes.
I changed the stepper motor a couple of years ago and cleaned the EGR as well a few months ago. Mpg is perfect at 23 ish (US) on hwy.
A checklist of sorts might help as I’ve been away from the car for some time. I do have OBD monitoring I intend to hook up today.
Car stalled leaving today and wife had to take another vehicle.