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O2 Sensor - 1998 Toyota Camry 2.2L 4-cyl

I was getting a few error messages p1135 being one of them, which seems to indicate that the O2 1st bank 1st sensor should be replaced. My car is 4cyl, so there is only one sensor under the hood (pre ...
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A most intriguing cold-start misfire mystery

I'm trying to help a friend out with a CEL on his 2009 Merc GLK 280. Hooked it up to an OBD2 reader and retrieved a single code: P0300 - 'Random/Multiple Cylinder Misfire Detected', via the 'OBD ...