Question about 2003 Mazda Mazda6

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Can I replace the ecm in my 2003 mazda 6, can I

Can I replace the ecm in my 2003 mazda 6 or do I need the dealership to do it. If I can do it, can I purchase a new ecm anywhere, I have only found rebuilt/used ones?

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You can do it your self but the computer/ecm will need to be flashed. any Mobile lock smith can re flash the computer to your key for a small fee

Posted on Mar 09, 2009

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Posted on Jan 02, 2017

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I have a 2003 mazda 6 2.3 engine has a misfire. could this be an ecm problem?


Have the fuel trims been checked? These (short term fuel trim - STFT and long term fuel trim - LTFT) can be checked with an OBDII tool, and can provide a lot of information about what may be happening. If you have a vacuum leak, for instance, the O2 sensors will report a lean condition to the ECM and it will add fuel to the engine to try to correct. You will see this in the fuel trim numbers.

So, yes, the ECM can cause the misfire, BUT if so, it's because something is not right in the engine. Have a qualified technician evaluate ALL parameters and determine what may be wrong. You've spent a lot of money on parts (O2 sensors, coils, plugs, wires, PCV valve and hose, alternator), and have invested a lot of your time. It's very possible that none, or only a couple, of those parts needed to be replaced. Invest in the expertise of a trained technician.

Nov 14, 2016 | 2003 Mazda 6

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Cylinders 4, 5 & 6 misfire. Lean bank 2 sensor 1 code and a mass air flow circuit code. 2003 Mazda Tribute V6. It was running fine then poof it was running rough. I am being told it may be a vacuum...


it is a regular fault
generally it is the Heated oxygen sensor (HO2S) in the exhaust manifold before the cat converter
other cause can include engine mechanical fault ( unlikely)---wiring---ignition / fuel system--injectors ---ECT/MAF sensor---ECM
a vacuum problem will affect both banks as will a PCV valve
The HO2S reads the exhaust gas composition and reports to the ECM which then adjusts the air /fuel ration accordingly to keep it within set parameters
The code says bank 2 sensor 1 which is the HO2S sensor so replace it and then have the codes read again

Dec 03, 2017 | 2003 Mazda MPV

1 Answer

Mazda 6 sport radio code


i know on some factory radios the radio code is sometimes on the back of the radio or in the owners manual. if its not there you will probably have to call the dealership and get it.

Apr 19, 2013 | 2003 Mazda Mazda6

1 Answer

Why did my 03 mazda miata die after two weeks in the garage after a new battery was installed? I just bought it and replaced the battery, I thought I was going to have power. Do I have to run it once a...


INSTALLING NEW BATTERY.WHEN DISCONNECTING BATTERY CABLES THE ECM WILL LOSE IDLE CONTROL MEMORY.TAKE TO MAZDA DEALERSHIP LET THEM RESET ECM SO CAR WILL IDLE STOP STALLING AT STOPS.

Aug 26, 2011 | 2000 Mazda MX-5 Miata

1 Answer

What will my 2003 Mazda 6 do if the Electronic Control Module needs to be replaced? What will the diagnostic show if run on the car if this is what needs to be replaced? I have replaced several parts...


The ECM seldom goes on any vehicle.There is two things I would check.One is fuel reaching the injectors?.Check this first.Two are you getting a spark?

Dec 18, 2017 | 2003 Mazda Mazda6

1 Answer

The display isnt showing the time


yes the blub is blown you have to remove the radio to replace the bulb give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local Mazda dealership in the parts department and they be able sell you the bulb and give you the pictures and diagrams you will need wish you the best of luck Michigan Man.

Apr 03, 2010 | 2003 Mazda Mazda6

1 Answer

Replace owner's manual


check ebay. otherwise, it's a call to the parts department at your local mazda dealership away.

Feb 16, 2010 | 2004 Mazda 6

1 Answer

I am looking for a part number for a 2003 mazda 6, but don't know where to find diagrams


if u call the mazda dealership they can email u a diagram with the part numbers on it.

Aug 13, 2009 | 2003 Mazda Mazda6

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