Ces | Test Questions And Answers For Engine Management

C) Replace ignition coil cylinder 2

Swapping ignition components is a classic isolation test. Since the misfire followed the coil, the coil is defective. Load-induced misfire often points to ignition breakdown under higher cylinder pressure. Plugs typically fail under idle or light load too; injectors wouldn’t move with coil swap; compression issues wouldn’t transfer. Question 3 – Oxygen Sensor Rationality Question: A car fails an emissions test for high NOx. At steady highway cruise, the upstream O2 sensor signal is switching slowly between 0.1V and 0.9V every 5 seconds. Downstream O2 sensor is steady at 0.7V. What is the most likely cause? ces test questions and answers for engine management

B) Vacuum leak

B) VVT solenoid stuck open

A) Clogged fuel filter B) Vacuum leak C) Weak fuel pump D) Restricted exhaust C) Replace ignition coil cylinder 2 Swapping ignition

Correction : Let’s stick to exam logic – high NOx + slow upstream switching + steady downstream at 0.7V = upstream sensor lazy, causing converter to run inefficiently, but converter not failed because downstream is steady. Answer = B. Question: DTC P0011 (Camshaft Position A – Timing Over-Advanced or System Performance Bank 1) is set on a VVT engine. At idle, the commanded intake cam angle is 0°, but actual is 15° advanced. Oil level and pressure are normal. What is the most likely fault? Plugs typically fail under idle or light load

A) Failed catalytic converter