I have a 2004 IS 300 that I purchased certified pre-owned from a Lexus dealer (so it still has about a year and half left of warranty). I noticed that after I pumped gas recently, the check engine light came on and my TRAC OFF is flashing on my dash. I took it to AutoZone and had it scanned and they let me know that there is a problem with the "oxygen sensor heater control circuit" - the guy said it's probably a failed oxygen sensor and that part alone is normally around $200.
Does that sound right? And, is this something that should be covered under my warranty? I haven't taken it to the dealer yet but would like to know before I do in case they try to tell me it's not.
Thank you!