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It has a speed sensor typically on the transmission that sends a signal to PCM computer and instrument cluster. Generaly we use a scan tool to see if speed sensor is sending a signal. Could be a bad sensor, problem with wiring, PCM, and most often a failed instrument cluster.
You may have a vacume leak causing the fast idle. Also have seen a stuck PCV valve cause this a few times.
I have checked there estimator guide against what we charge and have it to be very accurate most of the time. As you may have noticed that it gives a high to low average for both independant and dealers. You might want to call your local shop or dealer for a phone quote to compare.
Common problem that the heater core gets clogged. We have had some sucess with backflushing the heater core versus replaceing it.
Could be a number of different things....but a failed timing belt comes tomy mind.
If the power steering motor can only be shut off by removing power to it, the control module, which is part of the pump, is bad, and the pump needs to be replaced. Check that the power steering pump cooling fan operates with the radiator cooling fan - if it does not, the power steering pump can overheat and this will shorten its life
Very commom problem with this car...but it is not the fuel....likey ignition coils failing or a wire harness problem. Nissan had TSBs published about this problem. Check on line for bulletins #NTB01-059 & NTB01-076B.
No way that I or anyone can say for sure what is wrong without having car and testing potentialy lots of different things. But one thing makes me think that since it was running ok before someone replaced crankshaft sensor, that it may relate to that. I see information that indicates there has been issues with the crankshaft reluctor wheel. It does not come with the sensor but the sensor works with that part. Also if timing belt was installed one tooth off it could cause this issue also. Better go back to the begining and start over.
Depends on what engine option you have the 3.4liter engine has 2 different sensors...one is on side of block and the other is other is on the front of the engine behind crankshaft pulley. Both 3.8 liter engines have 1 sensor in front behind crankshaft pulley.