Error Code P0109: What It Means & What To Do?
OBD Code P0109 - Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
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A sudden increase in the fuel consumption
and the engine performance along with occasional engine stalling and not
starting with improper throttle response may be an indication of problem with
the MAP/BPS sensor circuit, hampering the engine’s performance, thus indicating
OBD Code P0109.
OBD-II Code P0109 is defined as a
Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
Learn More About OBD Code P0109
Most manufacturers use a MAP sensor and a
separate barometric pressure sensor. In such a case, the MAP sensor is mounted
away from the engine and has a vacuum hose connected to it. The degree of
engine intake vacuum is gathered by the sensor and input is given to the PCM,
where it is compared with the input signal from the barometric pressure sensor,
intake air temperature, and other factors to determine actual altitude
(elevation above sea level). If the MAP sensor and BPS input signals vary by
more than the specified degree, a P0109 will be stored and a MIL illuminated.
What causes the problem
of Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent?
- Faulty
or damaged MAF (Mass Air Flow) sensor
- Leakage
in the Air Intake System
- Faulty
BPS (Barometric Pressure Sensor)
- Open,
shorted, frayed, or poor connection of the electrical wirings to the sensor and
circuit.
- PCM being faulty and taking wrong readings
- Clogged/broken
intake/inlet pipe
Replace/Repair These Parts To Fix OBD Code P0109
- Mass Air Flow
Sensor - A
faulty mass airflow sensor will cause problems similar to low compression or
low vacuum, and will also show symptoms similar to when your vehicle has low
fuel pressure from a faulty fuel pump. Thus, replace damaged/faulty MAF sensor
today!
- EGR Valve &
Parts - Check for bad EGR system and parts
that hamper the engine performance and can cause engine stalling and not
starting along with rough engine idles. Replace faulty components now!
- Throttle Body - Throttle body
is a really important component that helps the air intake system and controls
the airflow in the engine.
Check for faulty parts and replace them now!
- Manifold Absolute
Pressure Sensor - Faulty MAP sensor affects the fuel efficiency
and the engine performance and the intake systems as well. Replace faulty MAP
sensor now!
- Barometric Pressure
Sensor - Damaged/faulty
BPS will transmit wrong information to the PCM or nothing at all, affecting the
air intake and the fuel delivery system and thus the engine performance.
Replace faulty BPS now!
- Throttle Position Sensor - If the TPS is damaged or faulty, it may cause loss of engine power and acceleration along with reduced fuel economy. Replace faulty sensor now!
- Diagnostic Tool - Choose from our wide
variety of diagnostic tools to detect and correct the OBD code error.
Symptoms Of OBD Error Code P0109
Symptoms
of OBD code P0109 are as follows:
Common Symptoms
- Malfunction
indicator lamp (MIL)/Check Engine Light illumination
- Rough
running engine
- Black
smoke dispersing from tailpipe
- Hard
start or stalling of engine
- Poor throttle response and acceleration
- Decreased
fuel economy
How To Correct P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
The main
components to look for error and correct the OBD error are following;
- Damaged
Intake Manifold Gasket
- Faulty
Mass Airflow Sensor
- Faulty
MAP sensor
- Damaged
Barometric Pressure Sensor
- Damaged
EGR system
- Dirty
Air Filter
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Easy Diagnosis Of Engine Error OBD Code P0109
The
first step for the P0109 diagnostic code is to check for Technical Service
Bulletins (TSBs) that apply to your year/make/model/engine, and then visually
inspect the wiring and system components.
- Do a visual inspection of all MAF sensor wiring and connectors to make sure they are intact, not frayed, broken, routed too close to ignition wires/coils, relays, motors, etc.
- Check for any obvious air leaks in the air intake system.
- Inspect the MAF sensor wires or film for any contamination
such as dirt, dust, oil, etc.
- Clean the MAF and the air intake system mesh.
- Check for vacuum leaks to the MAP sensor, as it can also
trigger this DTC.
- Use a scan tool to monitor real-time sensor values from the MAF sensor, O2 sensors, etc.
- The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON.
- Do an exhaust back pressure test to determine if the
catalytic converter is clogged or not.
- Repair faulty PCM sensor that may require reprogramming.
- Replace Leaky and damaged intake/inlet pipe immediately.
- Faulty MAF (Mass Airflow Sensor) needs replacement as it
directly hampers the engine performance.
Common mistakes when diagnosing the
P0109 code
By far, the most common cause of a P0109 being stored is a
disconnected MAF sensor. When the air filter is checked or replaced, the MAF
sensor is often left disconnected. If your vehicle has recently been service,
and a code P0109 is suddenly stored, suspect that the MAF sensor has simply
been left unplugged.
Some of the common mistakes done while changing diagnosing
the OBD code P0109 are:
- Intake manifold leak
- Mass Air Flow (MAF) sensor failure
- Powertrain Control Module (PCM) failure
- Wiring issue