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.
1987 Audi 5000 CS, AutomaticFACTORY OEM SERVICE PROCEDURE
Oxygen Sensor
- Disconnect differential pressure regulator connector from side of regulator. Using Adapter (1315 A/1 ), connect Multimeter (US 1119 ) to differential pressure regulator and to the connector removed from the regulator.
- Set multimeter to 200Ma DC scale. Disconnect oxygen sensor connector. Start engine and let idle. Note reading on multimeter. Ground male end of oxygen sensor connector.
- Observe multimeter. Current should increase from 9Ma to 11Ma after 15 seconds. Reconnect oxygen sensor connector. Raise engine speed to approximately 3000 RPM for a few seconds.
- Let engine idle. Current should fluctuate approximately 1-3Ma in the -10Ma to +10Ma range.
Factory Service Tools
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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.