Hey guys, I'm getting a flashing CEL and pulled the codes having a P0300 Random - Multiple Misfire Detected and a P0137 Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2.
What can be going on....? It's got 188,000Km on it. I got some new plugs and wire to try those first, but would like to figure out if it's something more major....?
o2 sensor is the code it is most likely o2, if its off enough it will cause misfires.
I guess, I'll change it and see if it cures the problem. Fingers crossed after reading many posts, I really hope it's just that!
I noticed oil in the 3rd cyl plug area....??? valve cover leaking or something else?
that doesnt help the misfires, but yeah, that is most likely a valve cover gasket.
Would I have to replace the gasket or just retorque the screws...?Originally Posted by petrified.rabbit
i would do the gasket. torquing the screw might crack the plastic cover.
P0300 for multi cyl misfire, in my experience was the coil which having a multi cyl misfire killed my catalytic converter and air/fuel ratio sensor (upstream O2)
I did end up reading your post about that... I hope it's not my problem as well... But what's the best way to test the coil seeing that it's $200 buck and not like plugs where I can say alright lets throw them in.
If it turns out being the coil let me know, I have an extra laying around.
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paulsaveo
Rescued Aveo