My jeep has 103,000 miles and I am trouble shooting a check engine light. my OBDii port is broken, previous owner must have kicked it. I am starting with O2 sensors and going from there. What other things might I check into?
You can read codes from the odometer.
I've found summit racing also has NTK O2 sensors available too.
Thank you. It show p-0440 code. Where do I start. It isn't the gas cap.
Go over every inch of vacuum hose especially any that run across the engine or the firewall. There should be a vacuum can under the battery and those hoses love to disintegrate and are hard to spot.
When I say go over I mean with your eyes and hands. Bend it and look for cracks.
Not Amazon...hit or miss they send you what you intended to order.