Question about 2001 Honda Accord

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My cars is ford fusion 2006 it has p0420

My cars is ford fusion 2006 it has p0420 my question is wich catalic converter i have to change the first one or last one because my car has 2

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Posted on Jan 02, 2017

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SOURCE: 2006 ford fusion ac problem

As a Ford dealer tech I found this was always caused by the AC compressor cycling switch, it shuts the compressor off when it reaches about 30 PSI, this prevents freeze up and saves fuel, when the system press rises again to about 42 PSI it turns the compressor back on and so on, change the switch, it is located in the low pressure line from the compressor, that is the one that gets cold.

Posted on Oct 06, 2008

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SOURCE: Ford Fusion 04 Engine Management Light

I had a 2002 model 1.4 Fiesta, same problem Engine management light or ECA, electronic accelaration Control (EAC), it needs a ford dealer to do a computer diagnostic, most likely that it will need replaced.

Mt friend who is a mechanic for ford said that it was a common factory fault and is very common in 1.4 zetec /duratec petrol models.

I now have a 2007 Fusion and was quick to see if this problem had been sorted on this model, and it has!!

Hope this helps!!

Posted on Dec 16, 2008

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SOURCE: '99 Accord: P0420 and Sometimes Engine Hesitation & Rough Idling

First thing I'd try is some "heet" or similar additive in tank to remove moisture, then refill with gas from a busy station & drive it for a while and see what happens.

Posted on Jan 02, 2009

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SOURCE: No radio volume (locked after changing battery of 06 Ford Fusion

Has to be unlocked by a dealer.

Posted on Jan 07, 2009

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SOURCE: '99 Accord: P0420 and Sometimes Engine Hesitation & Rough Idling

If the converter is failed (i.e. plugged) it can cause drive-ability problems (i.e. the engine can't get the exhaust out like it normally can). FYI,

Fix the known P0420 code first, then if the rough idle, etc continues, continue diagnosing. IMHO, don't worry about the MAF, etc. until you fix the "known" problems.

Posted on Apr 15, 2009

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1 Answer


P0420 = Catalyst System Efficiency Below Threshold Bank 1

Start wit checking O2 sensor and wires after catalytic converter.

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Hi.. On your Fusion the dome light will stay on
If the Body cumputer detect any door open,
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After 11 Minutes The Body will turn off the Light .
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To find wich Ajar switch is bad and have replace it
I hope this help on your question.

Thank you for use Fixya. Feel fre to ask anything..

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I have a 2006 fusion 3.0, I have a ticking noise so I had it scan at a Ford carage and the tell me that one cylinder is working, that I may need to replace the engine in the very near future,, what is

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May 04, 2012 | 2006 Ford Fusion

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I have a 2006 ford fusion sel and the light bulb in center floor console is burned out. How do I change it?

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1 Answer

Code P0420

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.

Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Mar 24, 2009 | Chrysler Concorde Cars & Trucks

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