I have replaced both camshaft sensor's, spark plugs, and battery in my infiniti i35 2002. It hesitates to start tcs slip and check engine lights are on.

Put some gas in the tank

Check fuel pressure at injector rail. Is there a security light flashing? If pressure is good, check for ac voltage at injector connectors.
Do It Yourself Diagnosis and Repair

A lot of vehicles have special tools that are needed to install the Camshaft Position Sensors. Where if you don't have the tools you can still put the sensor in but it might not be installed correctly. Also double check to make sure that the Crank Sensor is still tightly secured.

P0340 code means "Something" is wrong in the timing...
from CMP (Camshaft Position sensor) to the crankshaft bolt.

Very first thing, verify connectors are clean and shiny.
clear all codes, even hard codes.

I am not sure what "slip n tcs" means but on the 2005 nissan maxima the code P0340 is for the camshaft position sensor circit on bank 1, which is in the rear of the engine compartment. Code P0345 is for camshaft position on bank 2, which is in the front of the engine compartment. The images show the Cyl banks and a cam sensor.

• Disconnect the ground battery cable using a wrench to hold the terminal bolt in place as you loosen the retaining nut with another wrench.
  

Locate the accelerator cable next to the throttle assembly towards the back and top of the engine and remove the shield. Pull the retaining pins using a pair of slip joint pliers if necessary.

Remove any other accessories that might interfere with the removal of the camshaft sensor like wiring harness, spark plug retainers or engine cover, depending on your particular Ford Taurus model.

Move the fuel-injectors wiring harness off the valve cover studs as well to gain access to the camshaft sensor if necessary.

Locate the camshaft sensor around the top of the engine. For more information, see the Resources box at the bottom of this article.

Unplug the camshaft-sensor electrical connector by pressing on the lock tab and pulling the plastic connector off the sensor.

Unfasten the two sensor mounting screws using a Phillips screwdriver and remove the sensor from the engine compartment.

Installing the Camshaft Sensor

Position the new camshaft sensor in place and start the two mounting screws by hand to avoid damaging the threads.

Tighten the two mounting screws using the Phillips screwdriver.

Plug the camshaft-sensor electrical connector.

Realign the fuel injectors' wiring harness over the valve cover studs.

Install any other accessories you had to remove to gain access to the camshaft sensor like wiring harness, spark plug retainers or engine cover.

Replace the accelerator cable shield if you had to remove it. Use the slip joint pliers if necessary.

Connect the ground, battery cable using one of the wrenches to hold the terminal bolt in place and tighten the retaining nut with another wrench

Is your question is How to replace the CAMSHAFT SENSOR of Ford Taurus?

Here are the steps to do it..First step is how to remove the camshaft sensor then 2nd is the installation.

Removing the Camshaft Sensor

> Disconnect the ground battery cable using a wrench to hold the terminal bolt in place as you loosen the retaining nut with another wrench. Locate the accelerator cable next to the throttle assembly towards the back and top of the engine and remove the shield. Pull the retaining pins using a pair of slip joint pliers if necessary.

> Remove any other accessories that might interfere with the removal of the camshaft sensor like wiring harness, spark plug retainers or engine cover, depending on your particular Ford Taurus model.

> Move the fuel-injectors wiring harness off the valve cover studs as well to gain access to the camshaft sensor if necessary.

> Locate the camshaft sensor around the top of the engine. For more information, see the Resources box at the bottom of this article.

> Unplug the camshaft-sensor electrical connector by pressing on the lock tab and pulling the plastic connector off the sensor.

> Unfasten the two sensor mounting screws using a Phillips screwdriver and remove the sensor from the engine compartment.

Installing the Camshaft Sensor

> Position the new camshaft sensor in place and start the two mounting screws by hand to avoid damaging the threads. Tighten the two mounting screws using the Phillips screwdriver.

> Plug the camshaft-sensor electrical connector.Realign the fuel injectors' wiring harness over the valve cover studs. Install any other accessories you had to remove to gain access to the camshaft sensor like wiring harness, spark plug retainers or engine cover.

> Replace the accelerator cable shield if you had to remove it. Use the slip joint pliers if necessary. Connect the ground, battery cable using one of the wrenches to hold the terminal bolt in place and tighten the retaining nut with another wrench

hi, i have infinity fx 35 2003 it light on the service engine camshaft position sensor bank 1 , i replaced the bank 1 after 3 hour it light on again service engine + VDC off and slip i put the scanner it told me camshaft position sensor bank 1 again what can i do ?

my engine light is on and the tcs off and the slip light is on pleae help trubleshoot for me?

TCS and SLIP are part of the ABS system. Check the fluid level in master cylinder first. If that's OK, than you probably have a intermitent problem with one of the ABS sensors.You will need a scanner to find out which sensor in mulfunctioning, or wht the problem is. As far as the shaking condition goes, sounds like the car is misfiring. What is the code number that you are coming up with for the check engine light?? Have the spark plugs been replaced?? Replacement intarval on a 2002 Max is 105000 miles. These car seem to have a problem with the rocker cover gaskets, where iol leaks into the spark plug hole and fill the hole up, so you may need that cover, when you are replacing the plugs, but you will not know that, until you actually get inside of it. Let me know what the code is for the "check engine light" post results.