Rear heated oxygen sensor/s (HO2S)

The rear heated oxygen sensor/s (HO2S) has/have more importance in controlling fuel/ air mix than previously. The rear heated oxygen sensor/s (HO2S) have been moved nearer to the front heated oxygen sensor/s (HO2S), just in front of the metal monolith in the catalytic converter.

Signal characteristics:

• high voltage = rich mixture
• low voltage = lean mixture