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Code PO1200 and code PO303 could i have a bad brain?

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Po1200 is not a valid code, p0303 = missfire detected on number 3 cylinder

Posted on Dec 02, 2016

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Posted on Jan 02, 2017

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Misfires on cylinder 3 periodically. giving code po303


Misfire can b caused by bad ignition..fuelinjection or poor compression. Test these three. Connections may b worn. That cylindr mite hav a gasketleak

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Engine misfires. Battery dead/fixed. Po303 code: Changed plugs/wires, code cleared/reappeared. Misfiring again. Po420 code/then cleared. Po306 code. Replaced coil tower. Misfired again..


You either have a bad catalytic converter causing too much back pressure or you are running rich. I think cylinder 3 and 6 are on the same side of the engine (except opposite banks) right? Locate the fuel pressure regulator. Is it on the same side? I've seen those go bad and allow fuel to be sucked into the vacuum line causing a rich condition/ misfire on two or three cylinders on that side of the engine.

Nov 13, 2015 | 2005 Dodge Caravan

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P1200 [5a,92,12,0],


foult code po1200 5a,92,12,01 wht ect prob is wht it means

Mar 02, 2014 | Tata Cars & Trucks

1 Answer

Po303


code po303 refers to cylinder 3--misfire detected===causes --engine mechanical fault---wiring---ignition/ fuel system---injector---ECT/MAF sensor---ECM. check plug and HT lead to no 3 cylinder. Check that the injector to 3 cylinder is operational and not blocking or squirting. Have a compression test done to check for compression / gasket problems

Dec 14, 2013 | 2006 Chevrolet HHR

1 Answer

How u fix code po303 passat 2001


i still have same code po303 i have change spark plugs and coil i add a ground wire i can resat end drive for 20+ milages no check enigine light
turn off start up runs for minute or so then coms back on check enigine light same po303 enigine runs very smoth no vibration what so ever I AM LOST

Feb 16, 2013 | 2001 Volkswagen Passat

1 Answer

Po303 misfire


this code identifies that the computer in your vehicle has picked up that cylinder 3 is not fireing properly so i would say change the plug in cylinder 3 if not cured change the plug lead if thes dosent work then distributer cap or the electronic distributer check all these things in this order its just elimination really

Sep 02, 2012 | Ford Taurus Cars & Trucks

1 Answer

What does the code po303 mean


PO303 = Misfire detected on cylinder # 3 -- Possible need for tune up or related service Plug wires, spark plugs?. Good Luck, Ned

Aug 11, 2010 | 2004 Dodge Stratus

1 Answer

1997 k1500 5.7l po303 misfire on cylider 3 ...


could be fuel injectors flooding cilinder fuelregulator not working right there is new up gradeinjector system

Feb 10, 2010 | 1997 Chevrolet K1500

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2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark


might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

Mar 23, 2009 | 2002 Ford Windstar Cargo

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