Q: Code P0340

asked by on September 29, 2016

code p340 keeps coming back. the sensors that were changed where the one on the right and the front. I smell gas and car is running sluggish.

My car has 132000 miles.
My car has an automatic transmission.

Hello. Code P0340 sets due to many possible faults. The sensors themselves have to be tested using an oscilloscope to see if the output waveform meets spec. If the sensors were not tested, there may have been nothing wrong with them and that is why the Code has returned. DTC’s do not necessarily identify faulty parts. The only way to condemn a part is on the basis of a specific test procedure and diagnostic in the shop manual, wherein the specifications for the part will also be printed.

An expert can diagnose it for you to get the issue resolved promptly. Among the initial steps, you are to check the sensor wiring back to the ECM. If the crankshaft position sensor (CPS) is malfunctioning (it can be tested), such a failure could set code P0340. Code P0340 can also set if there is a fault in the VVT (variable valve timing) system on your vehicle. All of these possibilities, and quite a few others, have to be evaluated a mechanic. To have this checked for you, a qualified professional from YourMechanic can come to your home or office to diagnose the code and proceed with proper repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

How do I check and top off the windshield washer fluid?

Your windshield washer fluid serves a couple of purposes. Obviously, it helps keep your windshield clean and free of dirt and grime, but it also helps with deicing in the winter (as long as you’re using a winter formulation). Keeping...

Idle air valve calibration/adjustment

Hi there. It is suggested to have a bidirectional scan tool but it is not required. Verify the idle speed is within 650-750 rpm. You want to be at 700 rpm ideally. Connect data link connector terminals TEN & GND...

The car shakes when idling, stopped, or at low speeds

Hello. If the engine runs fine at high speeds and this only occurs at idle, then most of the time it is because of a vacuum leak. If there is a leaking gasket or vacuum hose, then this will occur....

Related articles

P0337 OBD-II Trouble Code: Crankshaft Position Sensor A Circuit Low Input
P0337 means that the crankshaft is suffering because of low voltage. This could be due to sensor not being aligned properly or electrical problems.
P0157 OBD-II Trouble Code: 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
P0157 code definition Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2) What the P0157 code means The oxygen sensor that trouble...
A Buyer’s Guide to the 2012 Nissan Murano
The The 2012 Nissan Murano is a sleek crossover SUV that has all the modern amenities. It has ample interior space with a luxurious feel, and a driver oriented suspension. If you need a vehicle that can hold passengers and...