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Hello all, Im stumped which is not hard to do and need help. I have codes 2004 Volkswagen Passat GLS 1,8 turbo that is intermittently starting and sometimes does not start. I I believe there are 12 codes here they are P0420 SPORADIC Catalyst System; Bank 1: Efficiency Below Threshold (16804) P1225 SPORADIC Cylinder #1 Fuel Injector Circuit - Short to Ground (17633) P1227 SPORADIC Cylinder #3 Fuel Injector Circuit - Short to Ground (17635) P1228 SPORADIC Cylinder #4 Fuel Injector Circuit - Short to Ground (17636) P1226 SPORADIC Cylinder #2 Fuel Injector Circuit - Short to Ground (17634) P0561 SPORADIC System Voltage Unstable (17833) P1547 SPORADIC Boost Pressure Controle Valve (N75): Short to Ground (17955) P1117 SPORADIC Oxygen (Lambda) Sensor Heating Circuit: B1 S2: Short to Ground (17525) P1435 SPORADIC Secondary Air Pump Relay (J299): Short to Ground (17843) P1421 SPORADIC Secondary Air Injection Solenoid Valve (N112): Short to Ground (17829) P1649 SPORADIC Powertrain Data Bus: Missing Message from ABS Controller (18057) P30C1 S Can anyone give me a clue as to where to start????
 
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