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Hi, like many new members I joined the board to tap the knowledge of all of the great folks on this board. I have a 99 2.0 that is throwing multiple code (p0302,p0303,p0301,p0116,p0300,p1128,p0411,p0134,) And yes it actually runs ok:) I have done the plugs, wire,fuel filter,mas o2..... I have read somewhere where a bad cat could possibly cause all those codes. Any thoughts?
 

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http://wiki.ross-tech.com/wiki/index.php/16500/P0116/000278

http://wiki.ross-tech.com/wiki/index.php/16684/P0300/000768

http://wiki.ross-tech.com/wiki/index.php/17536/P1128/004392

http://www.obd-codes.com/p0134

http://wiki.ross-tech.com/wiki/index.php/16795/P0411/001041

You have thrown a ton of parts at these codes; I wonder about the brands, part numbers and quality of the parts installed. Poor quality aftermarket parts; can cause all kinds of drivability and cel's: (e.g.: plugs, wires, fuel pump, maf, 02 sensor, etc). It is crucial; these be high quality; oem parts, for the car to run correctly. What scan tool are you using and does it have live data capability? I would start by seeing; if the 02 sensor is working (bank 1 sensor 1; live data) and see what brand fuel pump is installed; then test to see if the fuel pressure is in spec.

http://workshop-manuals.com/volkswa...essure_vacuum_and_temperature_specifications/

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