2000 Mercedes-Benz SL500 Problems: 1 Known Issue

On the 1996-2002 Mercedes-Benz SL500, mercedes V8s of this era adjust intake camshaft timing with a pair of electro-hydraulic camshaft adjuster magnets, one screwed into the front of each cylinder head. The engine control module energizes a magnet, which routes oil to the cam adjuster to advance the intake cam. The module then runs a plausibility self-test: it advances and retards the cam and watches the intake-manifold pressure signal over roughly a six-second window for the expected change. If the right-hand bank produces no corresponding change, the module stores P1519 — right adjustable camshaft timing solenoid (Y49/2). The mirror-image fault on the left bank stores P1522, and plenty of cars eventually set both. The usual cause is the magnet itself. These solenoids live in a hot, oily environment, and their coils open up or their plungers stick with age and varnish. Contaminated or overdue engine oil is the reliable accelerant, because the small oil passages the magnet controls silt up long before anything mechanical wears out. Wiring is the second-most-common cause: the short harness to the magnet runs across the front of the head, hardens, and chafes, and the connector wicks oil. Owners typically report a rough or shaky idle, a slight loss of pull off the line, marginally worse fuel economy, and a check-engine light that reappears within a few dozen miles of being cleared — a common forum account is the code returning roughly every 70 miles with the engine otherwise idling and running well. Because Mercedes also sets this code when the cam genuinely cannot reach its commanded angle, worn timing chain guide rails or a stuck adjuster are the less common but more serious possibility, and they must be ruled out before repeatedly replacing magnets.