20 Most Recent 2012 Nissan Sentra 2.0 Sedan 2.0L 4-cyl. 6-speed Manual - Page 4 Questions & Answers

The problem is likely in your heater case doors, not the core itself. These doors are either vacuum operated or small motor operated. Get the car warmed up, then feel both heater hoses. Both should be hot, meaning coolant is circulating. If only one is hot, the other cold, then you have a circulation problem.

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Try this. With engine cold, turn your key to the "on" position but don't crank the starter. Let it sit for about 5 seconds, then turn off. Turn back on and try to start. If it starts easier, you fuel pump is weak and probably needs to be replaced.

Always go with front 02 sensor first... ....do nothing else. Only front 02 sensor first. Use a good quality one. Napa is often the best source. Do not use a generic one. It must plug right in ... with no alterations to its plug.

They are usually a yellow 'P' shaped ring pull. It is usually at the front of the engine bay, between the engine and the front radiator grille.

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That 5th step is also 100 degree turn. This for 08 2.0L, note the engine code or what ever that is? If that mr2ode is correct, I'll see what I can find for crank and rod bolts.

Most auto parts stores where I live will check and give you the trouble code on your dash for free. Getting that code will help identify the most likely cause of the problem. The code usually give several possible cause's but will help minimize your search.

could be lower ball joint...throws camber off

This combination of codes indicates a wiring issue. Trace the wires from the sensors to find a broken wire.

If it is electric the motor or switch may be bad. If wind up window it may be off the track.

Catalytic converter heat shield? Loose timing chain? Failed timing chain guide?