Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 84 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent P0421 -00- Catalyst 1 Efficiency Below Threshold Bank 1 Overview: Code Cause Effect on Vehicle Fault Code: P0421 -00 1.DOC poisoned 1.CE Lamp Will glow 2.DOC temperature won’t rise Checkpoints: Check battery voltage Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check connector is connected properly Remove and reconnect again Step 2 Check catalyst temperature sensors physically and whether reading correct value. Physical check Step 3 Change DOC Remove and replace Circuit Schematic Diagram:
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