Consumer Guide's® Auto Editors have scoured repair bulletins and questioned mechanics to search for commonly occurring problems for a particular vehicle. In some cases we also give possible manufacturer-suggested solutions. In many instances these trouble spots are Technical Service Bulletins posted by the manufacturer, however, we have our own expert looking at additional vehicle problems.

Climate control: The temperature in the cabin may be warmer or cooler than the set temperature requiring adjustment of the sun sensor. (2006)

Doors: The power tailgate may reverse directions when closing due to a loose bolt for the gas strut. (2006)

None: The integrated garage door opener may resist programming unless the current program is erased, but the instructions may not be in the owner's manual to press and hold the two outer transmitter buttons until the signal light flashes rapidly. (2006)

Seat: The heated front seats may quit working due to failure of the signal acquisition module. (2006)

Steering noise: The steering shaft bearing may wear causing noises when turning. (2006)

Suspension problems: Numerous warnings about the suspension and brakes may be due to abrasion of the wires for the front wheel speed sensors. (2006)

Transmission problems: Harsh downshifts from second to first when braking may require a software upgrade, a revised valve body or both. (2006)

Vehicle noise: Noises (squeaks, grunts) from the rear end are due to design of the spring seats and revised units are available. (2006)

This table lists costs of likely repairs for comparison with other vehicles. The dollar amount includes the cost of the part(s) and labor (based on $50 per hour) for the typical repair without extras or add-ons. Like the pricing information, replacement costs can vary widely depending on region. Expect charges at a new-car dealership to be slightly higher.

2006: Hose clamps that secure power-steering fluid cooling hose to fluid cooler may not provide sufficient clamping force; loss of fluid could damage pump and result in diminished power assist.

2006-08: An incorrect software calibration number (SCN) coding received during a recent workshop visit can affect a number of functions: (1) the fuel gauge readings may be incorrect; (2) a stuck fuel-level sensor may not be displayed in the instrument cluster; (3) the check engine light may illuminate incorrectly; and, (4) the speedometer may be out of tolerance. In the event of a vehicle crash, the electrical fuel pump may not receive a crash signal that is required for the fuel pump to disconnect and prevent future fuel delivery as designed. Dealers will recode the SCN.

2006-2008 M-Class with trailer hitch: Some of the weld seams connecting the trailer-hitch receiver to the attachment bar used to secure the trailer hitch to the body frame do not meet performance specifications. This may result in the trailer-hitch receiver separating from the attachment bar. The trailer hitch must not be used for any purpose until it has been repaired. Dealers will repair the trailer hitch.

2007 M-Class with diesel engine: Engine may stall and not restart due to a failed crankshaft sensor. Dealers will replace the crankshaft sensor.

2007: Accelerator pedal in some vehicles might not have been fully fastened; over time, pedal may not maintain a consistent position, making it more difficult to operate.