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I recently bought a 2000 Nissan pathfinder. The service engine soon light came on as I was driving. The codes ran as a knock sensor and oxygen sensor in bank 1 and bank 2, high voltage. I notice around 35 mph the engine or transmission shudders. The car sat on the lot for a couple of months, so my first reaction was old gas. I filled it up with plus after running all of the old gas out and adding sea foam. Does this sound like a transmission problem or could a knock sensor be causing the shudder? The car switches between gears at low speeds without problems, including taking off.
My truck currently does not have heat, but the air conditioner works just fine. My thermostat will rise in the summer time with the air conditioner running, but when it is switched to hot air, the thermostat does not rise at all. I occasionally hear a clicking coming from my glove box area, but it is not a constant. My coolant levels seem to be just fine. Help!