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P121B Engine Trouble Code

Meaning of P121B engine trouble code is a kind of powertrain trouble code and when your car's 'P121B 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.

P121B Fault Symptoms :

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

If one of these reasons for P121B code is occuring now you should check P121B repair processes.
Now don't ask yourself; What should you do with P121B code ?
The solution is here :

P121B Possible Solution:

Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage.

P121B Code Meaning :

P	1	2	1	b
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine	Fuel And Air Metering	Manifold Absolute Pressure/Barometric Pressure Circuit High Input	Engine Shutoff Solenoid Malfunction

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.

P121B OBD-II Diagnostic Powertrain (P) Trouble Code Description

P121B engine trouble code is about .

Main reason For P121B Code

The reason of P121B OBD-II Engine Trouble Code is Manifold Absolute Pressure/Barometric Pressure Circuit High Input.

P121B DTCs may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.

	Example: 0140