Q: I changed my battery and now when I turn my key there is a very loud buzzing noise

An engine failure is definitely not good news. Engine failures can be caused by numerous things (e.g. low oil pressure, contaminants in the intake, etc.). Thankfully the 2007 Optima is covered by Kia’s 10 year, 100,000 mile power train warranty....

In my opinion, you should keep your tank at least half full (https://www.yourmechanic.com/article/how-full-do-i-need-to-keep-the-fuel-tank-at-any-given-time) at all times. This is not for any mechanical reasons but more for personal safety reasons. If you treat the halfway mark as if that were the...

The cargo light provides extra light to your trunk area. To turn on the cargo light, press the Cargo Light switch, directly next to the light. Press the switch again to turn off the light. Tips If the trunk is...

Hi, thanks for your question. If the axle has the retainer clip on the end of the inner joint but will not stay in the differential, then the differential may have been damaged from the accident. If you would like...

Hello. A knock can be caused by a number of things. It can be as serious as an internal engine failure or it may be a misfire or a failure in the timing belt. When a knock occurs I always...

Hi there. Check the fuel pressure regulator on the fuel rail. The regulator will adjust the fuel flow and adjust the pressure. If the regulator is working, then there may be a restriction in the fuel line. Remove the fuel...

Hi there. The rattling noise could be the drive belt or pulley that is loose when not under a load. When turning the wheels or on highway driving conditions, the noise may not be there for the engine is under...

Hello - the P0460 (https://www.yourmechanic.com/article/p0460-obd-ii-trouble-code-p0460-fuel-level-sensor-circuit-malfunction-by-conor-fynes) code is not a failure of the fuel gauge, but rather a discrepancy between how much fuel the Powertrain Control Module thinks is in the tank, and the fuel gauge reading. This problem occurs most...

As a colleague of mine used to say, "everything works, but the hands don't move," He used that expression when he had checked everything on a certain system and found it to be working correctly, but the system was still...