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When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction. Once you pull/read this code, you may begin diagnosis.
Hi, 1684 merely means that the battery was disconnected within the last 50 start cycles. If it stays on and that is the only code, then try disconnecting the battery and touching the ends of the cables together (not connected to battery!). Sometimes that confuses an overly sensitive electrical system into submission. (Not often, but it's cheap and worth a try. It's good maintainence anyway.) If the check engine light is on, there's something else going on. You will have to take the car to Auto zone to have it scanned, a code will be retrieved and interpreted to know what the problem is....
That may be so, but something is wrong. Get the codes pulled and you will know where to go next....ANY failure can trigger a light indication, but not all failures are noticable in terms of performance. It needs to be fixed.
Many things can cause the engine light to come ON. Best way to find out is to take the vehicle to an auto-parts store. Most auto-parts stores will scan the computer for a trouble code for free. They should tell you what the trouble code means that's causing the engine light to come ON.
1484 The catalyst seems to be overheating!
1684 The battery has been disconnected within the last 50 starts.
from what i have researched the 1684 is a common code that these vehicles give out..i even got one when i checked mine and i had never disconnected the battery before..so i wouldn't pay to much attention to that one...now the other code is a different story