1. Using an OBD-II Scanner:
This is the most reliable and convenient method. An OBD-II scanner (also called a code reader) plugs into the OBD-II port located under the dashboard, usually near the steering column. Most auto parts stores will have scanners you can borrow or rent, or you can purchase your own for home use. The scanner will read the trouble codes stored in the car's computer (PCM). These codes are standardized across many vehicles. Once you have the codes, you can look them up online (many free resources are available) or in a repair manual to determine the likely cause of the problem.
2. Using the Key-On-Key-Off Method (Check Engine Light Flash Codes): This method is less precise and only works for some vehicles. It's worth a try if you don't have a scanner readily available, but an OBD-II scanner is strongly recommended.
* Locate the diagnostic connector (DLC): This is usually under the dashboard near the steering column.
* Connect a jumper wire: You'll need a jumper wire (paperclip will work in a pinch) to connect the pins designated as TE1 and AL (typically pins 1 and 5 – check your vehicle's manual to be sure).
* Turn the ignition key on and off repeatedly: The Check Engine Light (CEL) will flash a series of codes. Count the number of flashes. This code sequence will have a pattern like 2 flashes, 1-second pause, 5 flashes, 1-second pause, etc. which translates to trouble code 25.
Important Considerations for the Key-On-Key-Off Method:
* This method is not always reliable and doesn't provide as much detail as an OBD-II scanner. It might only show a limited number of codes, or may not work at all on your specific vehicle.
* The sequence of flashes needs careful attention. It's easy to miscount, leading to inaccurate results.
* This method typically only reads codes stored in the Powertrain Control Module (PCM). It might not read codes from other control modules.
Recommendation: Using an OBD-II scanner is the strongly recommended method for accurately and efficiently reading trouble codes on your 2004 Chrysler Sebring Convertible. The key-on-key-off method should be considered a last resort if you cannot access a scanner. After obtaining the codes, remember to consult a repair manual or a reliable online database to interpret them.
