engine light just came on in my g6 2007 code p1174
P1174 indicates fuel trim cylinder balance malfunction. This means that your cylinder-to-cylinder air to fuel ratio is not balanced properly. Usually caused by a faulty heated oxygen sensor located on the exhaust or a simple vacuum leak. It will not harm your vehicle but it will lower your fuel mileage and the engine light will remain on until the issue is fixed, which will fail an emissions test for some states. This may be repaired free under your emissions warranty. Check with your dealer.
P1147 is the code thrown when a problem occurs with either an O2 Sensor or its electrical harness.
gas and air flow meter
Lean Condition caused by bad or restricted injectors
P1174 indicates fuel trim cylinder balance malfunction. This means that your cylinder-to-cylinder air to fuel ratio is not balanced properly. Usually caused by a faulty heated oxygen sensor located on the exhaust or a simple vacuum leak. It will not harm your vehicle but it will lower your fuel mileage and the engine light will remain on until the issue is fixed, which will fail an emissions test for some states. This may be repaired free under your emissions warranty. Check with your dealer.
p300 is a misfire
This is what the code sheet says Definition: Fuel trim cylinder balance Explanation: The ECM performs a fuel trim cylinder balance utilizing the heated oxygen sensor, when the calculated accumulated voltage exceeds a predetermined level this code is set Probable cause: 1. failed heated oxygen sensor 2. ignition problem 3. fuel injection problem 4. engine mechanical condition
it means fuel trim on bank 2 has reached full lean limts could be many things air or vacum leak bad cat. coverter or o2 sensor. should have dealer check coputer for latest computer flash update