U20A3 Mercedes-Benz Auto Trouble Code

Parts or components should not be replaced with reference to only a U20A3 Mercedes-Benz DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

The problem is caused by the variable cylinder management system switching on and off during light throttle conditions, at cruising speeds, or when driving on flat roads. The constant switching causes excessive oil consumption and the trouble codes appear when oil pressure drops to the point where it can no longer operate the VCM system.

U20A3 Mercedes-Benz Possible Solution:

Gasoline engines use spark plugs to cause an explosion of fuel within the cylinder. In a properly timed engine, this explosion occurs at the proper moment to send the piston to the bottom of the cylinder and provide power to the drive shaft. If the plug wires are out of sequence, the explosion occurs at the wrong time. The improper timing of the explosion sometimes pushes the cylinder the wrong direction or interferes with the turning of the crank. As a result, the engine stutters or backfires, if it runs at all.

U20A3 Mercedes-Benz Description For All Models :

U20A3 Mercedes-Benz Trouble Repair :

U20A3 Mercedes-Benz code shows that location the body harness connector, located in and around the left hand kick panel area or inside the IP (consult a shop manual for location). Water can leak into the connector from clogged sunroof drains, A-pillar leaks, or windshield or cowling leaks.

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