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Old 08-24-2019, 09:10 PM
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Default Catalyst Overtemperature notification

Hi, all! I was out tonight driving since it is such a beautiful even (mid-60s), and thought I’d push the car a little bit. I took it to about 100 twice after about 15-20 minutes or so of casual driving. About 20 minutes after the last run, I parked it and switched drivers, and the screen said “catalyst overtemperature”. Now, the car ran and drove absolutely fine even while that was blinking. It actually went off for a while until I had to take the interstate to get back home where it started blinking again.

Any thoughts? Could it be just a gremlin that needed shaken out (hadn’t driven it in a few days), or will my car and garage be incinerated beyond recognition tomorrow morning? Thanks!
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Old 08-24-2019, 09:48 PM
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O2 sensor(s) had the exact same issue, can be intermittent too. Can also be associated with a Start/Stop fault indication and may trigger a CEL.
Nothing serious and can still be driven but will need to be serviced.
Attaching an OBD reader should isolate the issue.
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Old 08-24-2019, 11:01 PM
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Hey thank you! With it being Saturday night I couldn’t call the dealership’s service department, so I appreciate you putting my worries in check.

Last edited by mellow_bo411; 08-24-2019 at 11:04 PM.
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Old 08-25-2019, 07:24 AM
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apparently there was a recall on the sensors which create these spurious warnings, if under warranty no cost, out of warranty you may still have a case for replacement, mention "recall" to your dealer...
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Old 08-25-2019, 10:09 AM
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That Catalyst Overtemperature notification might result from too rich fuel mixture, that overheats the catalysts. Be on alert. It is not good.
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Old 08-25-2019, 11:18 AM
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When you say too rich fuel mixture, what does that mean exactly? I drove it today for a little while and the notification wasn’t blinking.
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Old 08-25-2019, 11:41 AM
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Unless it’s a faulty gauge and there is in fact no overheating, a blinking catalyst light means pull over and shut down the engine. The reading from a OBDII reader (get one if you don’t have one) should tell what was going on. Not saying it’ll be a huge issue to fix at this stage, but if left to severely overheat it sure can be expensive.
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Old 08-25-2019, 11:47 AM
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I wanted to say that your overheated catalysts within a contentious time are abnormal for the car. The fuel misture burns in car's exhaust system overwhelmingly. You have to check all spark plugs and coils. Even if that error code is not on display I would double check those things which I mentioned above.
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Old 08-25-2019, 02:03 PM
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Ok, thanks everyone! Went ahead and scheduled a service appointment online for this Tuesday. I had it out again about an hour ago and it popped up along with the check engine light this time! Ah well, next week at this time it’ll be just a memory!
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Old 08-25-2019, 03:51 PM
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That’s a good call. But do keep the rest of us posted as to what the problem was. Good luck!
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