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How do i fix code p401 - 2002 Mitsubishi Diamante

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If your code is p0401 then its the egr valve.give it a GOOD clean out with petrol.

Posted on Sep 04, 2010

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97 ford escort p401 code


You may have carbon plugging the passages on the intake side of the valve. Remove the valve and start the engine. It should die or run very rough. if it idles normal then you have blockage that needs to be cleaned out.

Dec 05, 2013 | Ford Cars & Trucks

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Buick errors 420, 401, 1406


P420 is EGR system malfunction P1406 is EGR pintle position problem be sure and check power and ground before condemning the valve and the P401 is catalyst code i would fix EGR code first clear monitors and run a drive cycle to see if the cat code returned although the egr and catalyst are separate systems an EGR that isn't functioning may cause the emissions levels to be too high for a marginal converter to diffuse resulting in the cat efficiency code

Dec 10, 2012 | Cars & Trucks

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I have a 2000 mazda protege. I took it to get the emissions done and my car failed. Codes P401 system too lean bank 1 and the oxigen sensor. I replaced the o2 sensor and that code went away. I replaced the...


401 LEAN MEANS NOT ENOUGH FUEL OR TOO MUCH AIR , CLOGGED FUEL FILTER, IR VACUM LEAK. I BELIVE THAT CAR USES A MASAIR FLOW METER IF SO IT CANNOT HAVE ANY AIR LEAKS BETWEEN THE MOTOR AND AIR FILTER .

Apr 14, 2011 | Mazda Protege Cars & Trucks

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Have a p301, p305 codes (misfires) and p401, Engine runs really rough. 120000 and never changed spark plugs. Could a simple tune up fix this. Also replaced the egr back pressure sensor. What else could...


It is most likely an ignition system problem so starting by replacing the spark plugs and wires ia advisable.

If the problem persists then have the ignition module, and coil packs tested.

Feb 03, 2011 | 2002 Mercury Mountaineer

2 Answers

P401 emission code ford escape 2001 6cyl


P0401 shows an Exhaust Gas Recirculation Flow Insufficient. Without a good scan-tool you will be playing the "Parts Changing Game". Insufficient flow can be the result of a vacuum leak, bad MAP sensor, an exhaust leak, faulty EBP sensor, carbon build-up, and so on. I wish I could say more but with all the electronics it is more complicated then earlier cars.

May 12, 2010 | 2001 Ford Escape

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1996 Goe Prizm 1.6 P401


my first car was a 69 dart with 340 hi pro 4 speed bad *** car

Dec 20, 2008 | 1995 Geo Prizm

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