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Engine code P0420

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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?


Kevin
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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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