Common Mechanical Engine Problems and OBD II Codes

What are some common mechanical engine problems that can cause OBD II Diagnostic Trouble Codes (DTCs) to be set?

Common Mechanical Engine Problems and OBD II DTCs

Some common mechanical engine problems that can cause OBD II Diagnostic Trouble Codes (DTCs) to be set include:
  • Malfunctioning EGR valve
  • Bad spark plugs
  • Faulty oxygen sensor

These issues can trigger DTCs in the OBD II system, indicating problems that need to be addressed.

Explanation

The On-Board Diagnostics (OBD) II system is present in most modern vehicles to monitor performance and report issues through Diagnostic Trouble Codes (DTCs).

The powertrain of a vehicle consists of components like the engine and transmission, while non-powertrain components include systems like brakes and steering. OBD II codes are designed to monitor and report issues with both powertrain and non-powertrain components.

Technician A is correct in noting that mechanical engine problems can lead to the setting of OBD II DTCs. These problems can stem from various engine issues like the ones mentioned above.

Technician B is also correct in stating that OBD II codes monitor non-powertrain components. The Powertrain Control Module (PCM) is responsible for handling DTCs related to powertrain components, while other control modules oversee issues within their respective systems.

In conclusion, both technicians are correct. The OBD II system monitors both powertrain and non-powertrain components, and specific mechanical engine problems can indeed cause DTCs to be set.

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