Ford F-150 pickups with clunking driveshafts and Toyotas with noisy brakes are among the mechanical maladies covered in the latest technical service bulletins.
The bulletins, compiled by alldatapro.com, offer automakers' insights into some recurring problems with various models. The bulletins, known as T.S.B.'s, are not recalls; they are information provided by manufacturers to dealers' service departments and mechanics.
Unless noted, the carmakers do not offer payment assistance for these repairs beyond normal warranty coverage. Alldata.com sells a more comprehensive version of the bulletins to consumers. Here are recent examples:
BMW Owners of some 2012 3 Series models may want to have their coolant expansion tank checked. In T.S.B. 170113 issued on March 1, BMW said a poor contact at the electrical connector for the coolant level sensor might lead to inaccurate readings. Replacing the tank and connector should prevent false alarms.
CHEVROLET Owners of 2012 Sonics can check on a service campaign that involves their vehicles' stabilizer bar link. In T.S.B. 12172 issued on Jan. 28, General Motors said the stabilizer bars might have lower ball joint boots that were subject to dirt and water intrusion. Replacing the stabilizer bar link quiets the din.
FORD Driveshafts may need to be replaced in some Ford F-150 trucks. In T.S.B. 13-3-13 issued on March 26, Ford said that in some 2009-12 models, the rubber-bonded joint in the driveshaft center support bearing might show signs of separation, leading to a clunk or vibration. If separation has occurred, the driveshaft assembly needs to be replaced.
Also, finding the right seating position in some Ford Escapes could be a challenge. In T.S.B. 13-2-19 issued on Feb. 28, Ford said some 2009-12 models might have rust on the track assembly for the power seat, which makes moving the seat difficult. Removing the seat, cleaning off the rust and painting the track will make for smoother moves.
KIA Some 2012 Optima Hybrids may be in need of a new purge control solenoid valve, a component of the emissions control system. In T.S.B. SA142, issued on March 1, Kia said that the wrong part might have been installed. Owners may be alerted to the problem by the check engine light. Installing the proper part will cure the problem, Kia said.
LEXUS Some models will receive an extended warranty on internal engine parts according to T.S.B. CSP-ZLA issued on April 15. Lexus said intermittent misfires and increased oil consumption in some 2006-10 IS 250 and IS 250C models and 2006 GS 300s might be tied to problems inside the engine. The bulletin is a follow-up to a 2011 T.S.B. that extended the warranty on pistons, piston rings, valve springs and related components to six years or 72,000 miles.
TOYOTA Uneven rear brake pad wear may plague some Toyotas, causing grinding or scraping noises when slowing down. In T.S.B. SB0048-13 issued on March 25, Toyota said the problem in certain 2009-13 Corolla and Matrix models was most likely caused by problems with the rear disc brake pads.
This article originally appeared in The New York Times.