P0420 code on a 2001 INFINITI -qx4

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OBDIITech · Answer 1 · 2018-03-22T23:37:56+0000

You should start by fixing the P1140 code. Sometimes the code is caused by dirty engine oil.

P1140 INFINITI - Intake Valve Timing Control Performance Bank 1

Read more: https://www.autocodes.com/p1140_infiniti.html

P0420 INFINITI - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420_infiniti.html