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U1691 Engine Trouble Code

Meaning of U1691 engine trouble code is a kind of network trouble code and theoretically you can drive for a few weeks or even months with a broken MAF sensor. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. At a shop, the replacement cost is between $240-$400 depending on the car, but that's usually the cost of parts because the labor is relatively simple.

U1691 Fault Symptoms :

Check engine light comes on
Engine stalling or misfiring
Engine performance issues
Car not starting

If one of these reasons for U1691 code is occuring now you should check U1691 repair processes.
Now don't ask yourself; What should you do with U1691 code ?
The solution is here :

U1691 Possible Solution:

The crankshaft sensor signals the fuel injection computer or the ignition control when the cylinders are firing. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time.If either sensor isn't working correctly, the car will run rough and the engine will be less efficient. In later car models, the car's computer can usually keep the vehicle running, but the engine warning light on the dashboard goes on to warn the driver.

U1691 Code Meaning :

U	1	6	9	1
OBD-II Diagnostic Network (U) Trouble Code For Engine	Fuel And Air Metering	Fuel Temperature Sensor B Circuit Range/Performance	Crankshaft Position Sensor A Circuit Malfunction	Crankshaft Position Sensor A Circuit Low Input

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue.

U1691 OBD-II Diagnostic Network (U) Trouble Code Description

U1691 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Main reason For U1691 Code

The reason of U1691 OBD-II Engine Trouble Code is Fuel Temperature Sensor B Circuit Range/Performance.

U1691 the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.

	Example: 0140