Logo

B3521 Engine Trouble Code

Meaning of B3521 engine trouble code is : When your car's 'B3521 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. But in many cases, it means at minimum that you'll be visiting the car dealer to locate the malfunction and get the light turned off.

B3521 Possible Solution:

B3521 Engine

Gasoline engines use spark plugs to cause an explosion of fuel within the cylinder. In a properly timed engine, this explosion occurs at the proper moment to send the piston to the bottom of the cylinder and provide power to the drive shaft. If the plug wires are out of sequence, the explosion occurs at the wrong time. The improper timing of the explosion sometimes pushes the cylinder the wrong direction or interferes with the turning of the crank. As a result, the engine stutters or backfires, if it runs at all.

B3521 Code Meaning :

B 3 5 2 1
OBD-II Diagnostic Body (B) Trouble Code For Engine Ignition System Or Misfire Fuel Composition Sensor Circuit Malfunction Turbocharger Boost Sensor A Circuit Low Crankshaft Position Sensor A Circuit Low Input

Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above.

B3521 OBD-II Diagnostic Body (B) Trouble Code Description

B3521 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Reason For B3521 Code

The reason of B3521 OBD-II Engine Trouble Code is Fuel Composition Sensor Circuit Malfunction.

B3521 DTC reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.