93 300SE O2 sensor heater problem

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93 300SE O2 sensor heater problem

04-28-2025, 09:22 AM

dgwestfall dgwestfall is offline

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93 300SE O2 sensor heater problem

I have a code 22 on pin 4 on my 93 300SE that states O2 sensor heater, open or short circuit. Barring a loose connection where the wire locks on to the harness, I assume I simply need to replace the O2 sensor? Is there a separate connection for the heater portion between the O2 sensor and the ECM?

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