Logo

B3421 Engine Trouble Code

Meaning of B3421 engine trouble code is a kind of body 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 $200-$300 depending on the car, but that's usually the cost of parts because the labor is relatively simple.

B3421 Fault Symptoms :

  1. Check engine light comes on
  2. Engine stalling or misfiring
  3. Engine performance issues
  4. Car not starting
If one of these reasons for B3421 code is occuring now you should check B3421 repair processes.
Now don't ask yourself; What should you do with B3421 code ?
The solution is here :

B3421 Possible Solution:

B3421 Engine

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.

B3421 Code Meaning :

B 3 4 2 1
OBD-II Diagnostic Body (B) Trouble Code For Engine Ignition System Or Misfire O2 Sensor Heater Circuit Malfunction Turbocharger Boost Sensor A Circuit Low 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.

B3421 OBD-II Diagnostic Body (B) Trouble Code Description

B3421 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Main reason For B3421 Code

The reason of B3421 OBD-II Engine Trouble Code is O2 Sensor Heater Circuit Malfunction.

B3421 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.