Code 21, 27 - O2 Sensor Signal

WARNING: This page is about a different car, the 1993 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Code 27 applies to 5S-FE only.

Fig 1: Code 21, 27 Flow Chart (All Engines) - O2 Sensor Signal

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Fig 2: Code 21 Schematic (3S-GTE) - O2 Sensor Signal

Fig 3: Code 21, 27 Schematic (5S-FE) - O2 Sensor Signal