QR25DE (2.5L, 02-Present)
Just bought an 03 w 260k miles. Runs really rough. No water in oil. Codes P0037, P0138 and P0300. No excessive exhaust smoke. Looking for where to start. Will faulty O2 sensor foul plugs? Can you hear faulty injectors on these w stethoscope? What are common issues to look for on high mileage...