P0420: Why is my cat possibly dead?
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12-08-2017
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From: Nelson, BC
P0420: Why is my cat possibly dead?
Hi everyone,
I have a P0420 code on my 2011 Sport 4x4 and I believe my bank 1 cat is dead:
History:
Thanks!
I have a P0420 code on my 2011 Sport 4x4 and I believe my bank 1 cat is dead:
- rattling sounds coming from the area
- voltage waveforms that match each other on O2 sensors 1 and 2.
History:
- I got the check engine light and P0420 code. 135000 km on the odometer.
- Changed my air filter, 47000 km since last replacement. Very dirty from dusty gravel roads.
- Checked my O2 sensor voltage waveforms on bank 1 and downstream sensor 2 was following upstream sensor 1.
- Changed my O2 sensors to new NTK sensors. Old Ford sensors had sooty black tips. No change to voltage waveforms, still following each other.
- Cleaned MAF sensor with no residue electronic cleaner. No change.
- Long term fuel trims are bank 1: 0-2% and bank 2: 2-4%. What does this even mean?
Thanks!
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