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Lexus
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2009
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IS 250 AWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System (DTCS P0420 - U0101 & Circuit Tests)
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SFI System
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MIL Circuit
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Inspection Procedure
Inspection Procedure
HINT:
Troubleshoot each problem symptom in accordance with the chart below.
MIL remains illuminated
Start inspection from step 1
MIL not illuminated
Start inspection from step 4