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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSJEEP1989WRANGLER BASE, 4.2 T, STANDARD, BA10/5REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM2.5L TBI CEC TESTINGCOMPONENT TESTINGHEATED OXYGEN (O2) SENSOR
1989 Jeep Wrangler Base, 4.2 T, Standard, BA10/5
Heated Oxygen (O2) Sensor
1989 Jeep Wrangler Base, 4.2 T, Standard, BA10/5SECTION Heated Oxygen (O2) Sensor
NOTE:
For additional oxygen sensor information, see TITANIA OXYGEN SENSOR TESTING
article.
- On Comanche, Cherokee and Wagoneer, disconnect O2 sensor connector. Using an ohmmeter, connect ohmmeter leads to sensor connector terminals "A" and "C" (marked on connector).
- On Wrangler, connect ohmmeter leads to sensor connector terminals "A" and "B" (marked on connector).
- Ohmmeter should read between 5-7 ohms resistance. Replace O2 sensor if reading is not within specification or if ohmmeter displays an infinity reading.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.