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Automotive Technical Discussion Forum

Professional automotive forum for all types of vehicle repair discussion that does not fit into one of our more specific technical forums. Discussions include both OBD and OBD2, engine performance analysis, diagnostic best practices, service information, vehicle standards such as J1962, J1939, J2534, OBD2 modes (e.g. MODE$06), ignition and fuel system analysis, alternative propulsion (e.g. hybrid, electric, natural gas), and more. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the Technical Theory Forum.

Recent Automotive Discussions in the Automotive Technical Discussion Forum

Quick Lube nightmare?
10/08/2025 in the Technical Discussion Forum
I'm old and retired and live a thousand miles from my daughter who is near Boise, idaho. Visiting there this week she mentioned that recently a check engine light came on and her favorite quickie code reader store read p0014 and sold her a related part an...
O2 sensor replacement practices
10/07/2025 in the Technical Discussion Forum
If an O2 sensor is deemed defective, do you recommend replacing the O2 sensor upstream [or downstream] in the same bank as a practice? Management at my shop is doing this, I will not weigh in right now with my opinion. I wish to arm myself with the facts ...
Ignition Cylinder & Keys
10/06/2025 in the Technical Discussion Forum
[Driveability: 08 Freightliner Sprinter 2500 3.0L] Have this vehicle needs new ignition cylinder and keys. Mercedes has said they are on back order for over a year now, the cylinder is not available. Anyone have another route to go? Mercedes can get the ...
Def system service warning will not reset
10/04/2025 in the Technical Discussion Forum
[Driveability: 20 Ram 3500 Tradesman 6.7L] This truck came in with melted def pressure line ( bad exhaust gasket). Fixed everything up ,even put heat shielding on pressure line. Reset the codes, primed the line, ran aftertreatment verification test, all ...
No visible leaks, but air getting into hydraulic system
10/02/2025 in the Technical Discussion Forum
[Brakes: 13 Dodge Dart Limited 2.0L] So here is the history. We replaced the master cylinder with a new one because the brake pedal was soft and there was air in the system in all 4 wheels. The original master cylinder was leaking from the back side into...

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