P0111 - OBD Trouble Code

<<See All OBD Codes

The P0111 error code can be defined as intake air temperature malfunction. It generally refers to a problem on IAT circuit range or some other performance problem which can be caused due to short or open circuit.

You will be surprised to know that the IAT is actually a thermistor. This means that would keep on varying its overall resistance as it all depends upon the temperature of the engine air intake. It generally measures the rise as well as fall of the air temperature in the intake manifold. This would then later send the important data to the powertrain control module to control the air fuel ratio and ignition spark, including some other components of the emission control systems as well.

What causes this problem with the Intake Air Temperature (IAT) sensor circuit range or performance?

• The IAT sensor range input to the ECM can go to -40°F or 240°F indicating a short or open circuit
• The IAT sensor input to the ECM may turn erratic and could stop giving a steady stable reading

1. Powertrain Control Module - If there is any fault detected in the powertrain control module, then it will flash OBD Code P0111. Replace faulty PCM components now!
2. Engine Control Module - Faulty ECM will affect the exhaust system and this would hamper the engine performance and output. Replace faulty ECM components immediately.
3. Intake Air Temperature Sensor - Faulty/damaged IAT Sensor will reduce the performance of the vehicle. Thus, it is important to replace it immediately.
4. Fuel System - Problematic Fuel System can be a reason why P0111 code is appearing over and over again. Replace faulty Fuel System components immediately.
5. Intake Air Temperature connector - Faulty IAT connector can be troublesome. Thus, replace it immediately.
6. Intake Air Tube - Is your ECU perfectly correct, but still seeing P0111 code? Then there is definitely some issue with the Intake Air Tube.
7. Air Filter - Did your mechanic just found out that there is some fault in the Air Filter? Buy top notch Air Filter from us at economical prices.
8. Wiring Harness - A broken Wiring Harness can cause a lot of issues. It would be nice if you get it replaced on time.

For us our customers are everything, and that’s why we will help you to diagnose P0111 code by mentioning some important symptoms below:

Common Symptoms

• The check engine light may be turned on by the engine control module and would go into a failsafe mode
• The car engine may face a hard start condition
• There can be a decrease in the fuel mileage
• The exhaust may start emitting black smoke

• The IAT connector short should be repaired or replaced
• Repairing or replacing the wiring short as necessary
• The sensor should be repositioned back into the air filter housing or intake air tube
• Make sure that you carefully replace the IAT with a new sensor

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of air intake tube, temperature sensor, intake sensor and many more. Now all your problems would vanish within no time.

• First of all, a visual inspection should be done by the mechanic to determine if there are any electrical connector, wiring, or sensor issues
• Then the codes received would be scanned and documented by the technician and view the freeze frame data to see when the code was set
• Then the codes should be reset to clear the OBD-II fault codes and after that you can retest the vehicle to see if the code comes back or not
• The sensor’s live data would be observed by the mechanic on the scanner for temperature output to be within specifications
• If you find out that no problems are noted, then the next step would be to perform a manufacturer’s specific pinpoint tests for the code and get it repaired as per the requirements.

Common Mistakes When Diagnosing The P0111 Code

• You must perform a visual inspection of connections and wiring
• A big mistake can be not following the manufacturer pinpoint test procedure step-by-step and skipping steps
• Keep this in mind that IAT sensor should be replaced only when tests indicate a problem
• Not connecting a new or known good sensor to the harness and viewing the ECM data to see if the temperature output from the sensor is as expected