P00A9 OBD Error Code: Problem & Solutions

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Are you experiencing diminished fuel efficiency? Is your engine giving issues during cold start? Is the car engine stalling and losing acceleration? All these can be the indication of OBD Code P00A9.

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to all 1996-newer vehicles (Ford, Mazda, Mercedes Benz, etc.). Although generic, the specific repair steps may vary depending on make/model.

A stored code P00A9 means that the powertrain control module (PCM) has detected an intermittent input signal from the 2 intake air temperature (IAT) sensor circuit on bank 2. Bank 2 is the side of the engine that does not contain the number one cylinder.

The PCM uses the IAT input signal and the mass airflow (MAF) sensor input signal to calculate fuel delivery and ignition timing strategy. Since maintaining a correct air/fuel ratio (typically 14:1) is critical to engine performance and fuel efficiency, the input of the IAT sensor is very important. The IAT sensor can be threaded directly into the intake manifold but is more commonly inserted into the air inlet pipe or air cleaner box. At any rate, it must be positioned so that (with the engine running) ambient air, drawn into the intake manifold through the throttle body, can continuously and consistently flow across it. The IAT sensor is usually a two-wire thermistor sensor. Sensor resistance varies according to the temperature of the air that flows across the cold wire element. Most OBD II equipped vehicles utilize a reference voltage (five-volts is normal) and a ground signal to complete the IAT sensor circuit. The varying resistance levels in the IAT sensor element cause voltage fluctuations in the input circuit. These fluctuations are interpreted by the PCM as changes in intake air temperature. If the PCM detects a certain number of intermittent signals from the bank 2 number 2 IAT sensor, over a set period of time, a code P00A9 will be stored and a malfunction indicator lamp may be illuminated.

What causes the problem with the IAT Sensor Circuit?

• Problematic IAT (Intake Air Temperature) Sensor
• Faulty wiring/ connections to the IAT sensor and circuit
• PCM (Powertrain Control Module) fault in sensor
• Break or damage in the intake/inlet pipe
• Intake/inlet pipeline getting clogged
• MAF (Mass Airflow Sensor) damaged

1. Air Temperature Sensor - The air entering the engine is detected by this sensor. As it is a very important step in combustion, this sensor plays a crucial role in the performance. Replace faulty sensor now!
2. Air Intake Kits - The proper air to fuel ratio enables proper functioning of the engine, which is managed by the air intake systems. Replace air intake kits from us.
3. Air Flow Sensor Connector - It is very important component as it provides vital information regarding the air intake to the engine control unit. Replace faulty connectors with us! 
4. Engine Control Module - Wrong OBD Error Code can also be stored due to faulty ECMs. It’s better to get the faulty ECM electricals replaced as soon as possible.
5. Powertrain Control Module - P00A9 error code can also flash due to rare problems with the PCM. Replace faulty PCM related components immediately.
6. Coolant Temperature Sensor - This sensor is vital for proper functioning of the air intake system, fuel delivery system and the engine performance. Thus, a faulty coolant temperature sensor now!
7. Diagnostic Tool - Choose a high grade and accurate diagnostic tools to detect and correct the OBD code error. Find all types of professional tools from us.
8. Auto Switches & Sensors - Common causes behind that P00A9 error code can be defective switches or faulty sensors. Replace these components immediately to solve OBD error code.

This P00A9 error may cause reduced power, the engine may run rough, or the engine may crank but not start. There is typically an illuminated Check Engine light as well. At Parts Avatar Canada find genuine replacement parts and performance parts for your vehicle available for all makes and model be it Volvo, Chevrolet, Ford, Dodge, Porsche, Ford, Land Rover, Audi, Hyundai, Fiat, etc. This error may also indicate problems that will likely affect:

Common Symptoms

• Significant Drop in engine power
• Poor driveability & acceleration
• Reduced fuel economy and increased fuel consumption
• Abnormal throttle response
• General reduction in efficiency

Some of the common fixes for the problems in the OBD Code P00A9 for all makes and models are as follows;

• Replace faulty Intake Air Temperature Sensor and Circuit
• Repair or replace damaged wiring/connections to the IAT Sensor
• Replace PCM (Powertrain Control Module) if damaged and can also be reprogrammed if found faulty and tested again if the error reappears or not

We have stocked a wide range of best priced ECM/PCM parts, transmission control systems, Car harness/wiring, solenoids, fuel pressure regulators and a lot more to help you out in fixing your car.

P00A9 is properly diagnosed with an advanced scan tool capable of factory sensor readings (not just one from an auto parts store). A qualified technician can read the data from the advanced scan tool to determine when the problem occurred, or if it is still occurring. They may clear the code/light and test drive the vehicle while monitoring the scan tool data to see if the fault returns or is present.

Based upon the conditions of the test, possibly clearing the code, and road testing the car while monitoring the data, further diagnosis may be required. Diagnosis may require multiple tools such as:

• A technician typically begins by hooking the vehicle up to an OBD-II scanner in order to verify that the code is present, and check for other codes.
• This data along with freeze frame data is recorded, and the codes are then cleared to see if they reoccur.
• Next, there should be a visual inspection of the wiring and connectors to check for loose connections, corrosion, or shorts.
• Replacement of Damaged wiring/connections to the IAT (Intake Air Temperature) Sensor
• 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 OBD Code P00A9

The IAT sensor signal is used by the PCM to calculate fuel delivery strategy, therefore a code P00A9 should be treated as severe.