This question has the word EXCEPT. For this question, look for the choice that could NOT meet the described situation. Read the entire question carefully before choosing your answer. Long-term fuel trim is a Self-Learned value. Disconnecting the MAF sensor or using a scan tool can clear a learned value. Many fuel system and emission components have a direct effect on the air/fuel mixture ratio. Self-Learning Control should be cleared each time any of these components have been replaced or repaired, EXCEPT:

ASE identifies engine performance as an individual service area. The engine performance service area involves these systems. Ignition system:  components that ignite the fuel and air mixture at the proper time to create maximum power and minimum emissions. The fuel system: Components that transfer fuel from the fuel tank to the engine cylinders in the proper amounts so as to create maximum power and minimum emissions. The exhaust system: Components that remove combustion by-products from the engine. The emission control system: Components that reduces the amount of harmful gases emitted from... Show more

ASE identifies engine performance as an individual service area. The engine performance service area involves these systems. Ignition system:  components that ignite the fuel and air mixture at the proper time to create maximum power and minimum emissions. The fuel system: Components that transfer fuel from the fuel tank to the engine cylinders in the proper amounts so as to create maximum power and minimum emissions. The exhaust system: Components that remove combustion by-products from the engine. The emission control system: Components that reduces the amount of harmful gases emitted from the vehicle.

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