Skip to content
Project JDM

Mitsubishi Evo IX (CT9A) Complete Factory Maintenance Schedule

Evo IX Maintenance Schedule

Mitsubishi Lancer Evolution IX CT9A
Legal in 2030
Mitsubishi Lancer Evolution IX
CT9A (2005-2007)
Power
See specifications
0-60
See specifications
Top Speed
See specifications
Current Market Value
Contact for pricing
Find Your CT9A

🇺🇸 US Import Information

This vehicle will become legal to import in 2030 under the 25-year exemption rule. Check our import guide for details on the process.

Disclosure: We may earn a commission from purchases made through affiliate links. This helps support our comprehensive JDM guides at no cost to you. See our full disclosure policy.
Mitsubishi Lancer Evolution IX (CT9A)
Maintenance Schedule for 2005-2007 | Engine: 4G63T MIVEC 2.0L Turbo Inline-4
3,000 Miles / 3 Months
1 tasks • routine maintenance
routine
Visual Under-Hood Inspection
Easy DIY
Check engine oil, coolant, intercooler water spray reservoir, ACD/AYC fluid reservoirs. Check for oil leaks at valve cover and head gasket.
15 min
DIY Cost$0
Shop Cost$50

Tools Required:

Flashlight
Clean rag
  • Allow engine to cool
Common Issues & Solutions
Preventive maintenance based on known issues with this model
ACD fault indicator light on dash, 3-mode button non-responsive
moderate
Cause:

ACD controller error or low/contaminated ACD hydraulic fluid

Solution:

Read codes with Mitsubishi MUT or aftermarket scanner. Fluid change first, then bleed ACD pump. Controller replacement if no resolution.

Estimated Cost:$150-$2,500 depending on cause
AYC pump noise at full turn lock, rear diff whine
moderate
Cause:

AYC pump air intrusion or pump aging

Solution:

AYC system bleed via Mitsubishi procedure. Pump replacement if whine persists. AYC delete is common (-$500, -20 kg) for dedicated track cars.

Estimated Cost:$100 (bleed) to $1,800 (pump replace)
Turbo shaft play, loss of boost at high rpm
critical
Cause:

Stock TD05HR turbo bearing wear — common above 80k miles under boost

Solution:

Replace with upgraded FP Green or Tomei ARMS M7960 turbo

Estimated Cost:$1,800-$3,500
Oil pressure drop at idle hot
critical
Cause:

Oil pickup strainer clogging or oil pump wear (MIVEC oil control)

Solution:

Drop oil pan, clean pickup. Replace oil pump if still low. Switch to 10W-40 or 15W-40 for hot climates.

Estimated Cost:$300-$1,200
Cracked exhaust manifold flange
moderate
Cause:

4G63T cast iron manifold heat cycling

Solution:

Replace with stainless steel tubular manifold (Tomei, HKS) — addresses cracking and improves flow

Estimated Cost:$800-$1,400
Disclosure: We may earn a commission from purchases made through affiliate links on this page. This helps support our free maintenance guides. See our full disclosure policy.

Evo IX Maintenance Schedule