2001 — 2005
2.6L V6 (M112)
Petrol
Check transmission fluid for glycol contamination | Note: Early M112 models (Valeo radiators) are prone to coolant leaks into the transmission, leading to torque converter failure.
Cold start idle inspection | Note: Listen for rough idling or misfires; check for vacuum leaks, which are common due to aged intake manifold gaskets.
Verify HVAC operations | Note: Test all zones; the plastic stepper motor linkages in the W203 climate control system are notorious for snapping.
Inspect wheel well arches and sills | Note: Check for early signs of rust, as NZ's coastal conditions can be harsh on the W203 body panels.
Routine oil and filter service; inspect cabin pollen filter due to NZ pollen levels.
Spark plug replacement (12 required for twin-spark M112) and transmission fluid/filter flush.
Coolant system overhaul, replacement of engine/transmission mounts, and fuel filter service.
Perform full synthetic oil change every 10,000km to protect the M112's V6 valvetrain.
Replace the valve cover gaskets if oil weeping is detected.
Monitor the Mass Air Flow (MAF) sensor and clean or replace if fuel trims deviate.
Check the serpentine belt and tensioner pulley assembly for bearing noise.
Ensure the electronic brake system (SBC if applicable or standard ABS) fluid is flushed biennially.
Estimated repair costs if issues arise
High priority; requires immediate attention if shifting becomes erratic.
Budget for this after 120,000km as the W203 front end wears out on NZ's uneven roads.
Standard scheduled maintenance; costs fluctuate based on brand choice (Bosch/NGK).
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer