Curriculum
Module 07advanced
Emissions & Aftertreatment
Diagnose oxygen sensing, EGR, DPF/GPF, regeneration, SCR and smart exhaust sensors electrically.
Lessons
06
Estimated time
210 min
Completed
00/06
By the end of this module
Separate electrical command and sensor faults from genuine flow, temperature and aftertreatment problems.
Lessons
6 total
- 41Lambda / oxygen sensors and fuel-control feedbackA petrol engine runs rich and logs mixture faults. Is the oxygen sensor reporting the problem, causing the problem, or simply reacting correctly?Members only35 min
- 42EGR systems — electrical command vs actual gas flowEGR position says 40% commanded, but the engine behaves as if no exhaust gas is flowing. Is the valve electrically dead, mechanically blocked or is the air-path data misleading?Members only35 min
- 43DPF / GPF sensing — soot, ash, differential pressure and EGTDPF fault says ‘filter overloaded’. Before condemning the filter, prove whether the pressure and temperature sensors are telling the truth.Members only35 min
- 44DPF regeneration diagnosis — why a regen will not completeThe vehicle keeps requesting regeneration but soot load returns quickly or the forced regen is refused. What prerequisite is stopping the strategy?Members only35 min
- 45AdBlue / SCR system diagnosisCountdown says ‘no start in 500 miles’ and the customer assumes it only needs AdBlue. How do you diagnose the complete SCR system instead of just topping up the tank?Members only35 min
- 46NOx, EGT and smart exhaust sensorsSCR efficiency fault remains after parts have been changed. Which sensor is actually telling the ECU whether the aftertreatment system worked?Members only35 min