× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

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

P0171 P0174
08/21/2026 in the Technical Discussion Forum
[Driveability: 02 Ford F-150 King Ranch 5.4L] Hello IATN This one is kicking my tail. After 40 plus years still time to learn something new. This ford has 270000 miles the clock. Pass smoke test several time. No leak at the rear pcv hose , booster pinch...
91 f250 front axle cv joint
08/20/2026 in the Technical Discussion Forum
[PowerTrain: 91 Ford F-250 Custom 5.8L] The right front outer wheel joint on this truck is a cv joint. The inner u joint on this axle and left side outer joint are regular cross type u joints. It looks like a factory setup, not something somebody cobbled...
P0171&174
08/19/2026 in the Technical Discussion Forum
[Driveability: 06 Jaguar XKR Victory Edition 4.2L] On this car we had lean LT fuel trim both banks +25%. Initially we searched for air leaks first by isolating the crank case (close off purge and vacuum sources) and observe ST fuel trim @ idle. No change...
Mystery lean codes & Rear main seal
08/19/2026 in the Technical Discussion Forum
[Driveability: 12 Jaguar XKR 5.0L Mil Lamp On] Hey everybody, this Jaguar drove me nuts! Our customer returned the next day after we replaced his leaking cam covers complaining of a check engine light. We found lean codes both banks. LT fuel trim was aro...
2013 F150 Need CMP CKP waveform - No Start
08/13/2026 in the Technical Discussion Forum
[Driveability: 13 Ford F-150 XL 3.5L] Working on this truck that was towed in. Lost power and died while driving. Has just about every cam correlation code stored. All 6 coils are firing near TDC, adding fuel makes no difference, truck will crank, but no...

Automotive Sponsored Discussion Forums