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C3721 Engine Trouble Code

Meaning of C3721 engine trouble code is : When the check engine light comes C3721 code on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.

C3721 Possible Solution:

C3721 Engine

Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.

C3721 Code Meaning :

C 3 7 2 1
OBD-II Diagnostic Chassis (C) Trouble Code For Engine Ignition System Or Misfire Fuel Rail Pressure Sensor Circuit Malfunction Turbocharger Boost Sensor A Circuit Low Crankshaft Position Sensor A Circuit Low Input

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.

C3721 OBD-II Diagnostic Chassis (C) Trouble Code Description

C3721 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Reason For C3721 Code

The reason of C3721 OBD-II Engine Trouble Code is Fuel Rail Pressure Sensor Circuit Malfunction.

C3721 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.