According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1996-2002 Mercedes-Benz SL500 has 1 documented issue. No issues are rated critical, indicating generally reliable ownership. Across all issues with published estimates, repair costs range from $150 to $900. DIY maintenance guides at au7o.io.
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.
Common Symptoms
Rough or shaky idle
Check engine light with P1519, sometimes joined by P1522
Mild loss of low-end power
Slightly reduced fuel economy
Code returns shortly after being cleared
How to Fix
Test before you buy. Unplug the right-bank magnet at the front of the passenger-side cylinder head and measure coil resistance across the two pins — an open circuit or a wildly out-of-spec reading condemns it immediately. If the coil measures fine, apply power and ground directly to the magnet with the engine idling; a working unit will audibly click and visibly change idle quality. No change means either the magnet's plunger is stuck or the oil passage behind it is blocked.
The cleanest confirmation is the swap test the Mercedes community has used for years: exchange the left and right magnets, clear the codes, and drive the car. If the fault moves to P1522 on the opposite bank, the magnet is bad and you have proved it for free. If P1519 stays on the right bank with a known-good magnet fitted, the problem is upstream — inspect the harness and connector for oil intrusion and chafing, check the fuse and control-unit side, and only then look at the mechanical side.
Replacing the magnet is genuinely a short job: three screws at the front of the head (M119 part 119 051 00 77), pull the old unit straight out, fit a new one with a fresh O-ring, and clear the codes. Change the engine oil and filter at the same time with the correct grade, since dirty oil is what killed the first one. If a new magnet, clean oil, and good wiring do not clear it, have actual cam timing checked with a scan tool that displays camshaft position — stretched chain, worn guide rails, or a seized adjuster is the remaining possibility and a substantially larger repair. Budget roughly $150-350 for a magnet, O-ring, and oil service, $400-900 if a shop does the diagnosis and both magnets are replaced, and well over $2,000 if the timing chain and adjuster have to be addressed.
What are the most common Mercedes-Benz SL500 problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1996-2002 Mercedes-Benz SL500 has 1 documented issue. The documented issue is: Right-Bank Camshaft Adjuster Magnet Fails Its Self-Test. None are rated critical, but regular maintenance is recommended.
Is the Mercedes-Benz SL500 reliable?
The 1996-2002 Mercedes-Benz SL500 has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Mercedes-Benz SL500 problems?
Repair costs for known Mercedes-Benz SL500 issues range from $150 to $900, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What year Mercedes-Benz SL500 is the most reliable?
Reliability varies across model years of the Mercedes-Benz SL500. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 1996-2002 Mercedes-Benz SL500 with 1 documented issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.
What is the 1996-2002 Mercedes-Benz SL500 Right-Bank Camshaft Adjuster Magnet Fails Its Self-Test?
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 m… Repairs typically run $150-$900. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
