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.
1988 Suzuki Samurai JXFACTORY OEM SERVICE PROCEDURE
Oxygen (O2) Sensor
CAUTION:
NEVER apply voltage to O2 sensor and NEVER use an ohmmeter for testing. Use only a DVOM for testing.
- Ensure engine is at normal operating temperature. Disconnect oxygen sensor. Attach DVOM to O2 sensor connector terminal and ground. Increase and maintain engine speed at 1500-2000 RPM. Turn wide open microswitch off by moving carburetor lever downward. DVOM should show a reading of about .8 volts.
- Decrease engine speed to 1000-1500 RPM. Disconnect mixture control valve vacuum hose at intake manifold. DVOM reading should drop below .2 volts. If not within specifications, replace O2 sensor.
Factory Service Tools
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.