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Home >> Toyota >> 1989 >> Van LE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes - EFI >> Diagnostic Tests >> Code 21 - O2 Sensor/Heater Signal >> Probable Cause
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Probable Cause

NOTE: Diagnostic circuit chart not available from manufacturer.
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