how do I use my sct to find out why service engine is on - 2003-04 Mach 1 Registry Owners Club

Mach1Junkie · 06-20-2015, 10:51 AM

How do I use the sct xcal3 to see why service engine soon is on? I have a custom tune that the guy did who dyno'd the car and I've been afraid to plug the sct in cause I don't wanna mess with the tune.

not a gt · 06-20-2015, 11:39 AM

I know how you feel, I did the same thing after a year of my tuner using my SCT, scared me to death to even plug it in. Make sure you have key off, plug it in and scroll to menu that says Read DTC, hit select or whatever your is and it will tell you to turn key on but don't start the car..wait a moment and codes will come up, as well after a repair you can clear the codes as well with no issues with tune in the unit.

Mach1Junkie · 06-21-2015, 12:33 PM

Thanks dude I'm gonna try that right now.

DSG2003Mach1 · 06-21-2015, 05:16 PM

You have to go through several steps to do anything with loading a different tune or making any changes, you aren't likely to accidentally do anything

Mach1Junkie · 06-22-2015, 10:58 AM

It said knick sensor, slow o2 , startup misfire, and cylinder misfire the engine sounds fine does this mean I have internal damage? I'm really worried now.

DSG2003Mach1 · 06-22-2015, 11:17 AM

do you have a power adder on the car? If not I wouldnt be too worried. Depending on when you did them last I would start with plugs and possibly coils (did it say which cylinder?)

I would replace whichever O2 is being reported as slow (depending on mileage might wanna just do both)

01yellerCobra · 06-23-2015, 03:02 PM

I ran the Accels. They're in a box on the shelf. The stock COPs are much better.

06-20-2015, 10:51 AM	#1
Mach1Junkie Registered User Join Date: Sep 2012 Location: lords valley, pa Posts: 211	how do I use my sct to find out why service engine is on How do I use the sct xcal3 to see why service engine soon is on? I have a custom tune that the guy did who dyno'd the car and I've been afraid to plug the sct in cause I don't wanna mess with the tune.

06-20-2015, 11:39 AM	#2
not a gt Registered User Join Date: Mar 2007 Location: Waaayy out in the country,leave your GPS at home! Posts: 4,825	Re: how do I use my sct to find out why service engine is on I know how you feel, I did the same thing after a year of my tuner using my SCT, scared me to death to even plug it in. Make sure you have key off, plug it in and scroll to menu that says Read DTC, hit select or whatever your is and it will tell you to turn key on but don't start the car..wait a moment and codes will come up, as well after a repair you can clear the codes as well with no issues with tune in the unit. __________________ 2003 DSG Mach 1-03 Cobra Term/T56 swap: 2.3L Whipple,3.37 Upper,4 lb.lower, ID 1000 injectors,LCD cooling mod,Billetflow idlers,200A Alt,oil cooler delete with MMR adapter plate,MM oil filter kit,FrozenBoost Heat Exchanger Flowtech L.T., Maganaflow O/R X with Magnapacks, FRRP D.S.,T-56 with 26 spline input shaft and anti venom mod with reverse lockout box, FR steel flywheel,Spec Stage 3+,Moser 31 spline axles,FR 3.73 gear Tuned by B.Kurgan 601Hp/558/Tq

06-21-2015, 12:33 PM	#3
Mach1Junkie Registered User Join Date: Sep 2012 Location: lords valley, pa Posts: 211	Re: how do I use my sct to find out why service engine is on Thanks dude I'm gonna try that right now.

06-21-2015, 05:16 PM	#4
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	Re: how do I use my sct to find out why service engine is on You have to go through several steps to do anything with loading a different tune or making any changes, you aren't likely to accidentally do anything __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

06-22-2015, 10:58 AM	#5
Mach1Junkie Registered User Join Date: Sep 2012 Location: lords valley, pa Posts: 211	Re: how do I use my sct to find out why service engine is on It said knick sensor, slow o2 , startup misfire, and cylinder misfire the engine sounds fine does this mean I have internal damage? I'm really worried now.

06-22-2015, 11:17 AM	#6
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	Re: how do I use my sct to find out why service engine is on do you have a power adder on the car? If not I wouldnt be too worried. Depending on when you did them last I would start with plugs and possibly coils (did it say which cylinder?) I would replace whichever O2 is being reported as slow (depending on mileage might wanna just do both) __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

06-23-2015, 03:02 PM	#7
01yellerCobra Registered User Join Date: Jan 2013 Location: San Diego, CA Posts: 1,104	I ran the Accels. They're in a box on the shelf. The stock COPs are much better. __________________ New Ride: 2004 Mystichrome Cobra-Accufab SBTB and plenum, Steeda 2.8" upper, Bassani X, Borla Stingers, Mcleod RXT, MGW shifter, Level 5 halfshafts, chrome FR500's, Stiffler's FIT system and DS safety loop, GT pumps, BA3000, tuned by owner

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