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 MANUALSPLYMOUTH1990LASER RS, 2.0 R, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESENSOR RANGE CHARTSENGINE CONTROLS - SENSOR OPERATING RANGE CHARTSO2 RESISTANCE (2.0L)

1990 Plymouth Laser RS, 2.0 R, Standard

O2 Resistance (2.0L)

1990 Plymouth Laser RS, 2.0 R, StandardSECTION O2 Resistance (2.0L)

OXYGEN SENSOR RESISTANCE (2.0L) ⁽¹⁾

Terminal No.

Ohms

1 & 4

⁽²⁾ 12

1 & 4

⁽³⁾ *

⁽¹⁾	Oxygen sensor can also be tested by measuring oxygen sensor output voltage. See appropriate SYSTEM/COMP TESTS article.

⁽²⁾	With an oxygen sensor temp of 68°F (20°C).

⁽³⁾	30 ohms or more with an oxygen sensor temp of 752°F (400°C).

RENDER: 1.0x

NO RELATED

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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.