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.

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HOMESERVICE MANUALSPLYMOUTH1994LASER RS TURBO, FWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSENGINE SENSORS & SWITCHESOXYGEN (O2) SENSOR (2.0L)

1994 Plymouth Laser RS Turbo, FWD, Standard

Oxygen (O2) Sensor (2.0L)

1994 Plymouth Laser RS Turbo, FWD, StandardSECTION Oxygen (O2) Sensor (2.0L)

O2 sensor is located at outlet of exhaust manifold or turbocharger. Disconnect O2 sensor connector. Using an ohmmeter, measure resistance between O2 sensor terminals No. 3 and 4. See Fig 1 . Resistance should be about 12 ohms with an O2 sensor temperature of 68°F (20°C). Resistance should be about 30 ohms with an O2 sensor temperature of 752°F (400°C). If resistance is not as specified, replace O2 sensor.
CAUTION: Damage to O2 sensor may result if battery voltage is applied to wrong O2 sensor terminals.
Warm engine until coolant temperature reaches 176°F (80°C). Apply battery voltage across O2 sensor terminals No. 3 and 4. See Fig 1 . Connect a digital voltmeter to O2 sensor terminals No. 1 and 2.
With engine speed greater than 1300 RPM, measure O2 sensor output voltage. Output voltage should be .6-1.0 volt. If output voltage is not within specification, replace O2 sensor.

Fig 1: O2 Sensor Connector Terminal ID (2.0L)

Courtesy of CHRYSLER CORP.

RENDER: 1.0x

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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.