Q: My car wasn't starting unless it was jumped off. So I bought a new battery and am having the same problem.

If the check engine light is on, downloading the trouble codes that have been recorded by the PCM will aid in the diagnostic. The battery warning light means there’s something wrong with the battery and/or charging system. The battery should be load tested. If the "new" battery is discharged, the mechanic would check to make sure there is not parasitic power draw that is causing your battery to rapidly discharge or cause low voltage even with a functioning alternator. You have an electrical fault of some sort and the causes could be a bad ground to the body, an intermittent failure in the charging circuit, corroded connections to the battery, and so forth. To get this resolved, I recommend you request a check engine light diagnostic. During such a diagnostic, a certified mechanic from YourMechanic would use a code scanner to retrieve the diagnostic trouble code(s) from your car’s PCM and then use those codes to find the fault that caused the check engine light to illuminate. Once the faulty part or component is identified, it is explained to your satisfaction and the mechanic will let you know of the cost to repair. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.