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Home >> Cadillac >> 1990 >> Seville Base, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM Trouble Code Charts >> ECM Code EO42: Left O2 Sensor Lean Signal >> Test Conditions:

Test Conditions:

Codes EO14, EO15, EO16, EO21, EO22, EO26, EO27, EO31, EO32, and EO34 clear, throttle switch open, throttle angle 6-29 degrees, coolant sensor greater than or equal to 136°F (58°C), oxygen sensor ready (closed loop), vehicle not accelerating or decelerating, RPM greater than or equal to 800 and canister purge has occurred at full duty cycle for 10 minutes since engine was running with coolant 176°F (80°C) and throttle angle 10 degrees or greater.