Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Catalyst system efficiency below threshold

Toyota Corolla (E120): Catalyst system efficiency below threshold

Dtc p0420 catalyst system efficiency below threshold (bank 1)

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Circuit description
The ecm compares the two waveforms of the heated oxygen sensors located before and after the catalyst to determine whether or not the catalyst performance has deteriorated. Air–fuel ratio feedback compensation keeps the waveform of the heated oxygen sensor in front of the catalyst alterna ...

Replacement
1. Remove clutch start switch assy  disconnect the clutch start switch assy connector.  remove the nut and clutch start switch assy from the clutch pedal support. 2. Install clutch start switch assy  install the clutch start switch assy with the nut. Torque: 15.68 Nv ...

Overhaul
1. Remove speedometer drive (mtm) gear Remove the speedometer drive (mtm) gear from the front differential case. 2. Remove front differential ring gear Place matchmarks on the front differential ring gear and front differential case. Remove the 8 bolts. Using a hamme ...