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U1209 Engine Trouble Code

Meaning of U1209 engine trouble code is a kind of network trouble code and U1209 if your catalytic convertor fails completely, you eventually won't be able to keep the car running. Your gas mileage will also be terrible, so you should try and fix it as soon as you can. Unfortunately, the average replacement cost is around $2,000 and you can't do it yourself unless you're an experienced mechanic.

U1209 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 U1209 code is occuring now you should check U1209 repair processes.
Now don't ask yourself; What should you do with U1209 code ?
The solution is here :

U1209 Possible Solution:

U1209 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.

U1209 Code Meaning :

U 1 2 0 9
OBD-II Diagnostic Network (U) Trouble Code For Engine Fuel And Air Metering Manifold Absolute Pressure/Barometric Pressure Circuit High Input Cold Start Injector 1 Malfunction Reverse Input Circuit

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate.

U1209 OBD-II Diagnostic Network (U) Trouble Code Description

U1209 engine trouble code is about Reverse Input Circuit.

Main reason For U1209 Code

The reason of U1209 OBD-II Engine Trouble Code is Manifold Absolute Pressure/Barometric Pressure Circuit High Input.

Parts or components should not be replaced with reference to only a U1209 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.