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2007+ Expedition & Navigator 2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator

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Old 08-09-2010, 07:12 PM
kjk kjk is offline
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Engine code P0420

Read and cleared engine code P0420. I drove it for a few days and the engine symbol is back on my dash. I have not read the code today, but feels like a P0420.

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2007 Expedition EL
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Old 08-10-2010, 06:17 AM
slc10844 slc10844 is offline
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Why do you say it "feels" like a P0420? The code is for B1 catalyic converter. There a quite a few possible causes.
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Old 08-10-2010, 06:12 PM
kjk kjk is offline
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I should say I think it is the same code.

There are a few possibilities and I am hoping to narrow it down if possible. Is it an O2 sensor or has someone had other troubles after getting this code?


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Old 08-11-2010, 05:21 AM
slc10844 slc10844 is offline
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Unless you have a scanner that can monitor the O2 sensors, I would replace the sensors. The ECM monitors front and rear sensors, and compares readings to determine if the converter is doing its job. Does the vehicle have, or ever had, a misfire problem? If not repaired quickly, the converter can be damaged and cause a cat efficiency problem that may not show up for some time
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Old 08-11-2010, 04:51 PM
kjk kjk is offline
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No scanner to monitor, no misfire problems.

Is this O2 sensor just behind the drivers side exhaust manifold?
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Old 08-12-2010, 11:37 AM
slc10844 slc10844 is offline
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B1 is the passenger side. The heated sensor is between the exhaust manifold and in front of the catalyic converter.
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Old 08-12-2010, 11:37 AM
 
 
 
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0420, 1999, 2000, 2001, 2006, b1, code, diagnostic, engine, expedition, expeditions, f150, ford, lightning, lincoln, navigator, p0420, po420

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