<https://caddyinfo.ipbhost.com/topic/58314-2009-cts-obd-code-p013a/>
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"Maybe you can help me before going to dealer. Story follows. Thanks in advance.\n \n\n\n\t2009 Cadillac CTS purchase new 78000 miles.\n\n\n\n\tProblem started after driving and idling all day. Sitting at idle noticed temp gauge started climbing quickly to 280 with hot warning light on. Immediately stopped and turned car off. Opened hood and car didn’t seem that hot and with no apparent leaks.\n\n\n\n\tVehicle returned to normal temp in approximately 30 minutes. Started up and car ran at normal temp (210) with no apparent problems. I have had a warning light on most of the life of car. Took to dealer several times and they reset it.\n\n\n\n\tI recently purchased an OBD II to check code. Received a code of p013a indicating lean bank 1 sensor 2.\n\n\n\n\tReset code and just started having A/C problems. No code returned and engine running normal temp. AC seems to be partially working when driving but no AC at idle.\n\n\n\n\tHave dealer appointment coming up but hoping you could help me as the dealer I purchased car from reluctantly agreed to look at it but said they do not usually work on vehicles more than 10 years old.\n\n"
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