Question about 2002 Mitsubishi Diamante

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How to fix diagnostic codes PO401 and PO 403 on 2002 Mitsubishi Diamante LS

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Posted on Jan 02, 2017

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SOURCE: diagnostic trouble code po 400

Need more info.... Did you check vacuum line, Solinoid,test unit with vacuum pump? Let me know and I will try to assist you.

Posted on Jan 26, 2009

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SOURCE: mercury sable 2001 duratec engine DOHC I get check engine light and diagnostic code PO401". Any suggestions?

Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.

Posted on May 30, 2009

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Posted on Jul 23, 2009

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Posted on Jul 27, 2009

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SOURCE: trouble codes PO174,PO401,PO420 NEED TO FIX SO I

P0174 means Fuel Trim too Lean (Bank 2)

P0401 means Exhaust Gas Recirculation Flow Insufficient Detected

P0420 means Catalyst System Efficiency Below Threshold (Bank 1)


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Posted on Sep 28, 2009

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ABS Brake light and check Engine soon light Won't shut off on my 2003 Diamante LS Mitsubishi how can I shut it off

have the fault codes read and fix what is shown up
could be a broken wire at one of the wheel sensors or something more serious

Apr 20, 2016 | 2003 Mitsubishi Diamante LS

1 Answer

I have a mitsubishi diamante 01 ls im having trouble with the service engine light not wanting to go off the code is for the oxygen sensor bank 2 sensor 1 I have had two different sensors put in but none...

Hello, welcome to FixYa...your descripton indicates it's a heated 02 sensor that is setting the code...why would you not replace the correct one the first time if in fact it really does need to be repalced? ---80% of the time an 02 sensor code is set there is nothing wrong with the sensor itself, the sensor is doing it's job, it has detected a malfunction and reported it to the ECM, the ECM turned the service light on, that is what sensors do, that is how they work. I have seen motorist spend over $700 dollars on sensors and still have the same problem. On average the life of an 02 sensors is 60-80k. A good technician will know if a sensor is bad from the voltage it's drawing. You could have a dirty fuel injector or MAF sensor resulting in a rich or lean fuel mixture that caused the 02 code to be set. I hope you understand by this explanation, that even by replacing the $380 sensor there is no gurantee the problem has be repaired. A good diagnostic scan and someone that knows how to read the feedback from that scan could give you a clear cut decisive repair procedure.
I hope this helps and best of luck with the Diamante...

Jul 16, 2011 | 2001 Mitsubishi Diamante

2 Answers

How to fix code po401 and po 340

here's a link to some information on the codes you asked about

good luck!

May 18, 2011 | 1996 Toyota Camry

1 Answer

What size socket should I use to open the drain oil plug in a Diamante 2002 ls?

The oil drain plug on an 01 Mitsubishi Diamante LS is a 21mm. No. You can not use an adjustable wrench as the pan has a recess where the bolt goes. No it is not a 17mm. All drain plugs are on the bottom of the oil pan genius. Dont answer the questions unless you KNOW the answer.

Jun 11, 2010 | 2002 Mitsubishi Diamante

2 Answers

P0442 code-2004 mitsubishi diamante

its an evap system small leak. most common cause is a loose gas cap. but could be any leak in the tank vent system

Apr 21, 2010 | 2004 Mitsubishi Diamante

2 Answers

I took off the distributor on my 2000 diamante ls and im pretty sure its installed corecctly andall the connectors are connected and all it does id crank

2000 mitsubishi diamante will turn over but will not start and now has no compression? how do u put in the compression so that the car will start.

Jan 13, 2010 | 2000 Mitsubishi Diamante

1 Answer

Engine Random Misfire code PO-300

P0300 is for random miss-fire, loose or defective gas-cap, water in the fuel, damaged vacuum line, clogged fuel and/or air filter, faulty plugs and/or wires, fuel injectors. These are more common reasons, there are others but this a good start.

May 15, 2009 | 2001 Mitsubishi Diamante

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