2004 — 2009
1.5L I4 (M266)
Petrol
Drive up a steep hill or accelerate firmly from a standstill to test the Autotronic CVT transmission. | Advice:
Start the vehicle multiple times when both cold and warm, listening closely for any slow crank, metallic whine, or lazy starter engagement. | Advice:
Drive slowly over speed bumps and rough road surfaces, listening for knocking or creaking from the front end. | Advice:
While stationary, rock the steering wheel quickly from side to side and feel for any internal play, knocking, or resistance. | Advice:
Standard minor service including engine oil and filter change, cabin filter replacement, fluid top-ups, and a thorough brake pad and rotor wear inspection.
Major service milestone. Crucial Autotronic CVT transmission fluid and filter change (essential every 60,000km to prevent premature failure), replacement of spark plugs, and brake fluid flush.
Comprehensive mechanical review including replacement of the accessory drive belt and tensioners, coolant flush, checking for timing chain stretch, and inspecting all suspension dampers and engine mounts.
Inspect the inner lower door seams and tailgate edges for paint bubbling, indicating moisture trap rust common on early W169 models.
Run an OBD2 diagnostic scan specifically targeting the transmission control module for stored speed sensor codes (Y3/9b1, Y3/9b4, Y3/9b5).
Test the operation of all electric windows and the complex louvred panoramic sunroof (if fitted) to ensure it slides smoothly without binding.
Verify battery health and alternator output; weak voltage on these models frequently triggers false ESP, ABS, and SRS warning lights.
Inspect the oil filler cap for milky emulsion, which can indicate heavy condensation from short NZ urban trips or early cylinder head gasket weepage.
Estimated repair costs if issues arise
If the transmission enters safe-mode, the TCM must be removed and sent to a specialist electronics repairer, or completely replaced.
While the parts are moderately priced, the extreme labor involved in dropping the engine drivetrain to access them drives up the bill significantly.
Replacing worn front dampers, strut mounts, and stabilizer links using high-quality German OEM parts to restore ride quality and pass WoF.
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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