LEMON Manuals: Even more car manuals for everyone: 1960-2025

Home >> Toyota >> 1990 >> Tercel DX, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - CARBURETED >> Circuit Tests >> Code 21 - Oxygen Sensor Signal >> Probable Causes

July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Probable Causes

O2 Sensor or Sensor Circuit
O2 Sensor
ECU

NOTE: Diagnostic chart not available from manufacturer.

scientia non olet · About LEMON Manuals