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P0400 Engine Trouble Code

Meaning of P0400 engine trouble code is a kind of powertrain trouble code and when your car's 'P0400 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.

P0400 Fault Symptoms :

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

If one of these reasons for P0400 code is occuring now you should check P0400 repair processes.
Now don't ask yourself; What should you do with P0400 code ?
The solution is here :

P0400 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.

P0400 Code Meaning :

P	0	4	0	0
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine	Intake Valve Control Solenoid Circuit Low	O2 Sensor Heater Circuit Malfunction	Cold Start Injector 1 Malfunction	Shift Solenoid E Performance or Stuck Off

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.

P0400 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P0400 OBD-II Trouble Code Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Dependin P0400 code.

Main reason For P0400 Code

The reason of P0400 OBD-II Engine Trouble Code is O2 Sensor Heater Circuit Malfunction.

P0400 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