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Excess HC/CO at idle with normal cruise suggests excessive fuel at idle. Leaking injectors drip fuel when closed, enriching mixture at idle but diluted at higher RPM. Fouled plugs confirm over-fueling. An open EGR (A) would lower HC/CO by diluting charge. MAP (B) faults cause load calc errors, usually across RPM range. Exhaust restriction (D) reduces power at load, not idle richness. ASE T1 stresses comparing emission patterns across loads to diagnose injector leakage.

Oil at bellhousing drain hole indicates failed input shaft seal. Output seal (B) leaks at rear. Vent (C) can worsen leaks but not location. Low oil (D) not cause. ASE T3 stresses input shaft seal inspection when leaks appear at front.

Disconnected wastegate actuator leaves wastegate open, preventing turbo boost. Injector (B) and DEF (C) affect fuel/emissions but not boost. Crank sensor (D) causes stall, not slow boost. ASE T2 stresses checking turbo actuator linkage when boost is low.

Cracked or broken fifth wheel bolts compromise trailer retention and are OOS. Monitoring (B) or tightening (C) unsafe. Welding (D) not acceptable. ASE T8 stresses coupling device integrity for safe operation.

Valve fault code points to ABS modulator valve sticking from corrosion or debris. Wheel sensor (B) would show signal code. Linings (C) and adjusters (D) don’t trigger valve stuck codes. ASE T4 stresses cleaning/replacing modulators when valves stick and generate ABS codes.