The owner of a 2007 Dodge Ram pickup built before Oct. 3, 2006, may come into your store with a complaint that the ABS and/or ESP/BAS warning lights are illuminated. When he/she does, hook up your scanner and immediately check for trouble codes. If the only code stored is C1240, it's likely the steering angle sensor has gone through an over-travel situation. Replacing the clockspring assembly (the steering angle sensor is integral with the spring) with a revised unit, part No. 05082062AG, should eliminate further trouble.
All 2005-07 RL sedans, in addition to 2008 models built from VIN JH4KB16..8C000001 through JH4KB16..8C004681, may turn on the Check Engine light and store DTC P0401 (insufficient EGR flow) in computer memory.
One possible cause for the problem is carbon buildup at the EGR valve opening in the manifold or on the valve's seat. Acura says the buildup is due to the unique spray pattern of the fuel injectors. Installing a set of new-design injectors, part No. 16450-R70-A01, with different flow characteristics should help eliminate the concern. After the new injectors are installed, replace the EGR valve, then clear the trouble code from PCM memory.
Drivers of 2006-08 Buick Lucerne models with 3.8L V6 engines may come into your store complaining of a buzzing noise and/or vibration from the brake and accelerator pedals. One likely cause for the trouble, says GM, is normal vibrations from the engine being transmitted through the fuel lines which, more often than not, are contacting the upper portion of the brake booster. The only reliable fix is to install a new-design fuel feed and evaporative emission pipe assembly, part No. 25978188. For your information, the new pipe assembly routes the fuel lines underneath the booster, out of harms way.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].