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Toyota Corolla Repair Manual: Catalyst system efficiency below threshold

Toyota Corolla Repair Manual / Diagnostics / Sfi system / Catalyst system efficiency below threshold

Dtc p0420 catalyst system efficiency below threshold (bank 1)

Inspection procedure
Hint: read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is usefu ...

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. Airfuel ratio feedba ...

Other materials:

Circuit description
The seat position sensor circuit consists of the airbag sensor assy center and seat position sensor. Dtc b1153/25 is recorded when a malfunction is detected in the seat position sensor circuit. Wiring diagram ...

Inspection procedure
1 Check door lock When the door does not operate manually, proceed to a.  when the door does not operate via the key, proceed to b. 2 Inspect door lock control switch W/ power window: remove the power window regulator master switch assy.  Inspect the master ...

Warning lights and indicators
The warning lights and indicators on the instrument cluster and center panel inform the driver of the status of the vehicles various systems. For the purpose of explanation, the following illustration displays all warning lights and indicators illuminated. ► Vehicles with a drive monito ...

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