Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test Procedure (Code Output)
Code Output, indications and actions to be taken.
- Code Output [Eng. ID(0)-1(0) or No display-11]
KOER Self-Test indicates a PASS. Action to take:- If Continuous Memory Codes were present, Go to CONTINUOUS SELF TEST .
- If Continuous Memory is a PASS Code 11 and a symptom is present, Go to DIAGNOSIS BY SYMPTOM .
- Code Output [Eng. ID(0)-1(0) or No Display-11]
KOER Self-Test indicates a FAULT. Action to take:- Go to KOER service codes. See KOER SELF-TEST - CIRCUIT TEST & STEP MENU (2.3L) under KOER CODE/TEST MENU.
- Always start with the first code displayed.
- Code Output [98-No Display-Any Code(s)]
Code 98 in place of the I.D. code indicates that the vehicle is in FMEM (Failure Mode Effects Management), see FAILURE MODE EFFECTS MANAGEMENT (FMEM), CODE 98 under DIAGNOSTIC AIDS. Key On Engine Off (KOEO) Self-Test DID NOT PASS. Engine Running Self-Test will not initiate until a PASS Code 11 is obtained in KOEO Self-Test. Action to take:- Perform Key On Engine (KOEO) Off Self-Test and address all codes displayed. Go to KEY ON ENGINE OFF (KOEO) SELF-TEST .
- Always start with the first code displayed.
- Code Output [No Code Display-Codes Not Listed]
Indicates Self-Test did not activate. Action to take:- Rerun Key On Engine Running Self-Test to verify the above condition.
- If condition is still present. Go to D14 - NO CODES/CODES NOT LISTED .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.