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Service engine soon., pro.'s did all of the following. mas flow cleaned, plugs changed, injecters all changed, cats all changed, all four 02seners new. What's next???

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Ok sooooo here we go again with more issues with my wifes 2003 beetle convertable. So i took it to autozone the other day because she mentioned to me that about hqlf way home from work her gas pedal was...


p 0031 is the heated oxygen sensor1 bank 1 replace itit is the one in the exhaust manifold before the cat converter
code p 0037 is the heated oxygen sensor in the other bank in the exhaust manifold before the cat converter code p 0418 refers to secondaryair injection(AIR) pump relay--circuit malfunction===replace the relay
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1999 Chevrolet Silverado, 5.3, 1500, 148K Miles. Problem when cold it has a miss under a load, but it will idle good. After warmed up no problem. After checking for a vacuum leak we replaced the following:...


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Multiple cylinder mis fire and then 300 301 302 303 304 codes also on can you help me out in anyway please its starts bucking around 60 mph have changed #2 cat mas plugs wires coil now i am...


those codes are telling you what you already know you have a miss fire. 300 is multiple and 301 thru 304 is the individual cylinder. could also be a fuel injector,or the injection system, bad gas or fuel filter ,vacume leak,realy it could be alot of things you have replaced plugs gapped correctly checked your wires and replaced your coil. so look to vacume leaks and injectors.
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