Dayton Daily News

Wheels: Tony writes, “I thought you gave some good advice to someone who had trouble with their automobile. It seems they are not alone. My 1997 Kia Sportage check engine light gives a code P1309. My mechanic says it says ‘chassis accessory sensor signal high’ and his computer gives him no info to fix the problem. It also says for 1997 only. Can you help me?”

Halderman: I checked service information and discovered that the code means “chassis acceleration sensor signal high.” This is a sensor used to detect rough roads and is part of the antilock braking system (ABS). The service information I have does not show the location or testing procedures for this sensor. If the vehicle has been involved in an accident or severe driving, then this sensor could have been damaged.

What would I do? If the vehicle has not been subjected to harsh driving conditions, I would clear the code and see if it appears again. A scan tool can be used to clear the code, but it can often be cleared by disconnecting the battery negative terminal and then depressing the brake pedal. This last step will drain any electrical charges from capacitors by discharging them through the brake light bulbs.

Reconnect the battery and start the engine. In most cases, the check engine light should be off. You may have to reset the radio stations and clock after clearing the code.

Wheels: An e-mail from Vaughn says, “I’m a long-time hot rodder and mechanic and just purchased a 2002 VW Beetle for my wife. In my initial service of changing oil, checking brakes, etc., I would like to check the automatic transmission and differential fluid levels. I have been told a scan tool is needed. Please recommend a procedure for the home mechanic to check these levels.”

Halderman: Many vehicle manufacturers are eliminating the dipstick used to check the level of the transmission fluid. This was done for several reasons, including:

1. This prevents the possibility of dirt getting into the transmission. When a dipstick is removed, dirt or moisture around the area can drop into the transmission, where it can cause severe damage.

2. The level may or may not be low, depending on the temperature of the fluid. As a result, fluid could be added when, in fact, it is not needed and result in the transmission being overfilled. If the fluid is overfilled, the pump inside the transmission will cause the fluid to become filled with air (aerated), which can cause shifting problems, as well as increased wear to internal parts.

3. The incorrect fluid could be added. There are many different types of fluids used in automatic transmissions today.

Therefore, I would recommend that a scan tool be used to check the level of the transmission during routine service for best results and peace of mind.