What are DTC, c a t, e g r, and 028 codes mean

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. I'd recommend a professional test, because the codes you shared are not OBD II codes. The 1996 model would have "P" codes indicating powertrain concerns. Codes also do not tell the whole story. It's more about approaching the symptoms and troubleshooting accordingly, while utilizing the clues provided by diagnostic trouble codes as guidance for testing and troubleshooting. As a result, without solid information, it's difficult to suggest where to go with your observations. I would suggest a shop near you perform needed testing. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.