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Showing results for tags 'CEL Codes P0301 P0303 P042'.
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Hi all I am not sure where to post this so I will give it a shot here. I will try to explain how things progressed and what I have done along the way. I hope it helps. After I bought the car used the check engine light was off and it came on a few days later and went off again for a few weeks. I checked the code and it was P0301, (Cylinder 1 Misfire Detected). The CEL would turn on and off occasionally so I changed the Wires, Plugs and coil pack and went ahead and did the 2 - O2 Sensors. Now over time I have earned 2 additional codes for my efforts. I have all three, (P0301, (Cylinder 1 Misfire Detected), P0303, (Cylinder 3 Misfire Detected), & P0420, (Catalyst System Efficiency Below Threshold)). I am not sure where to look or spend my money on the next possibility. The car runs great, doesn't miss or run rough at all. Starts without hesitation and moves down the road like there are no issues at all. When I bought it the Head Gasket, Water Pump and timing belt were all done. I wonder if I have an exhaust manifold leak that I cannot hear. If I have the outside vent open and am sitting idle at a light or a stop sign, Basically just sitting idling), I can smell exhaust. When driving I do not, and when I have the re-circulation, (Vents closed), I have no issues. Could I have an exhaust leak at the manifold and not hear the leak? Would this explain the codes and the smell of exhaust? I have read that an exhaust leak can throw these codes. I do not know what else to think since the car is running great, with exception of what I have mentioned. Any real input based on direct knowledge or experience with what I am experiencing is greatly appreciated. I have searched and went through forums for help. If you have direct experience and knowledge then please give a guy a hand with this. Thank you all in advance. Thank you all for your help.