Code came back as iat sensor reading high

The code P0137 means that your downstream O2 sensor has low volts. A rich running engine makes the voltage go high, not low. If the upstream sensor is not reading a rich or lean condition, then you need to replace your downstream O2 sensor.

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P0113 Intake Air Temperature Circuit High Input P0114 Intake Air Temperature Circuit
P0113 - Intake Air Temperature Circuit High Input

The powertrain control module (PCM) monitors the temperature of the air entering the engine. The PCM supplies a 5 volt reference voltage to the Intake Air Temperature (IAT) sensor. The IAT is a thermistor that varies resistance based on temperature. As the temperature increases, resistance decreases. Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.

Potential Symptoms: There will likely be no symptoms other than illumination of the Malfunction Indicator Lamp (MIL - Check Engine Light / Service Engine Soon).
Causes: A code P0113 may mean that one or more of the following has happened:
* Internally failed IAT sensor
* Faulty connection at IAT sensor
* Open in IAT ground circuit or signal circuit
* Short to voltage in IAT signal circuit or reference circuit
* IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
* Faulty PCM (less likely but not impossible)

Possible Solutions:
1. First, if you have access to a scan tool, is there an IAT reading? If the IAT reading is logical then the problem is likely intermittent. If the reading is less than -30 degrees, unplug the connector. Install a jumper wire between the harness connector signal and ground circuits. The IAT temperature reading on the scan tool should be maxed out at the high end. For example it should be 280 degrees Farenheit or higher. If it is, the wiring is okay, and it may have been the connection. 2. If it isn't install the jumper wire between the IAT signal circuit and the chassis ground.
3. If now the IAT reading on the scan tool is maxed out then check for an open in the IAT ground circuit. If you get no reading at all on the scan tool, it's likely that the sensor signal is open or the 5 volt reference is missing. Check using a DVOM (digital volt ohm meter) for a 5 volt reference. If it's there, then unplug the connector at the PCM and check for continuity on the IAT signal circuit between the PCM connector and the IAT connector.


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P0113 - Intake Air Temperature Circuit High Input

The powertrain control module (PCM) monitors the temperature of the air entering the engine. The PCM supplies a 5 volt reference voltage to the Intake Air Temperature (IAT) sensor. The IAT is a thermistor that varies resistance based on temperature. As the temperature increases, resistance decreases. Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.

Potential Symptoms: There will likely be no symptoms other than illumination of the Malfunction Indicator Lamp (MIL - Check Engine Light / Service Engine Soon).
Causes: A code P0113 may mean that one or more of the following has happened:
* Internally failed IAT sensor
* Faulty connection at IAT sensor
* Open in IAT ground circuit or signal circuit
* Short to voltage in IAT signal circuit or reference circuit
* IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
* Faulty PCM (less likely but not impossible)

Possible Solutions:
1. First, if you have access to a scan tool, is there an IAT reading? If the IAT reading is logical then the problem is likely intermittent. If the reading is less than -30 degrees, unplug the connector. Install a jumper wire between the harness connector signal and ground circuits. The IAT temperature reading on the scan tool should be maxed out at the high end. For example it should be 280 degrees Farenheit or higher. If it is, the wiring is okay, and it may have been the connection. 2. If it isn't install the jumper wire between the IAT signal circuit and the chassis ground.
3. If now the IAT reading on the scan tool is maxed out then check for an open in the IAT ground circuit. If you get no reading at all on the scan tool, it's likely that the sensor signal is open or the 5 volt reference is missing. Check using a DVOM (digital volt ohm meter) for a 5 volt reference. If it's there, then unplug the connector at the PCM and check for continuity on the IAT signal circuit between the PCM connector and the IAT connector.


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Keep in mind that the IAT (intake air temperature) sensor simply measures the temperature of air that is entering the engine. Intake air temperature is important because the higher the intake air, the higher the combustion temperatures. High combustion temperatures result in increased Nox (Nitrogen oxides) emissions. To keep these higher temps from causing increased combustion temps, the intake air tubing should be intact, allowing the engine to "breathe" air that isn't sampled from the engine compartment. The IAT measures air temp by using a thermistor, or a thermometer of sorts. The thermistor is supplied 5 volts reference voltage from the PCM (powertrain control module) and a ground. Usually, when the air temperature is cold the resistance in the thermistor is high and when the air temperature is warmer, the resistance decreases. This change in resistance changes the 5 V reference from the PCM, thereby informing the PCM of the temperature of incoming air. If the PCM notices that the incoming air temp is unusually high, say, 300 degrees, when the engine temp is still relatively low, it will set a P0112.

Symptoms: There may be no noticeable symptoms of a P0112 code other than an MIL (Malfunction Indicator Lamp). However, a emissions test may reveal higher Nox readings depending on the type of IAT failure. Or the engine may ping under load, depending on the type of IAT failure.

Causes: Usually the P0112 is caused by a bad IAT (internally shorted or open or otherwise damaged), but it could also be:
* No reference voltage to the IAT sensor due to an open wire
* Excessively high intake air temperatures
* Short to ground on signal circuit
* Damaged IAT connector
* Bad PCM

Possible Solutions:
Hook up your scan tool or code reader and read the IAT reading. With a cold engine, the IAT should roughly match the coolant reading, since both will read ambient temperature. If the IAT is reading excessively high, check the IAT connector for damage. If you find none, unplug the IAT sensor and recheck the reading. It should now read the minimum, around -20 deg. If it does, then replace the IAT sensor. But, if the reading is still high, unplug the sensor and check for resistance across the two wiring harness terminals. If there is infinite resistance, then the PCM itself is bad. If the resistance isn't infinite, then check and repair the short to ground on the signal circuit.

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0113 Intake Air Temperature Circuit High Input The IAT has told the computer the air temperature is -40 degrees. It can be a faulty IAT sensor, a faulty computer (PCM), or the wiring in between. Until the reading is accurate the computer will use a default value of 140 degrees. The sensor is in the air duct just past the air filter box. Check for a disconnected wire or poor connection at the sensor. With a scan tool, tests can be conducted to determine the faulty component. Here's what you can do without a scan tool. The IAT is a variable resistor, cold makes it gain resistance. You may check the IAT with an ohmmeter, it should not show 100,700 ohms (unless it's -40 degrees outside). If it shows 100,700 ohms, replace the sensor. 23 degrees is 12,300 ohms. 50 degrees is 5,670 ohms. 86 degrees is 2,238 ohms, 212 degrees is 177 ohms. The code is indicating a very high resistance in the sensor, or an open circuit (broken/disconnected wire), or hopefully not the computer. If the sensor's conductivity does not match the air temperature (it will have some resistance unless it is 262 degrees), check the wires. (Make sure key is turned off at least 10 seconds and remains off before disconnecting/connecting PCM connectors.) The two wires both go into Connector 2 (Black) on the PCM (on the right fender). The signal wire (tan) is pin 20. The ground wire (gray) is pin 28. Use an ohmmeter to check the continuity of each wire. Probe from the tan wire at sensor connector (A) to pin 20 of connector 2. It should have no resistance. Likewise, probe from gray wire at sensor connector (B) to pin 28 of Connector 2. It should have no resistance. If the wires check out, wait a couple of days and see if the light goes out. If not, you can go buy a new IAT sensor (even if it did not have infinite resistance) since the only other option is the big bucks PCM. Or you may take it to the dealer and have them diagnose it. But failing all else I would try as a 2nd to last resort replacing the IAT sensor. Check the connector at the sensor carefully for a bent or backed out pin, corrosion. It most likely is a bad sensor, or a bad connection.

Inspect the IAT sensor and wiring. The sensor is located in the air induction tube near the air filter. I've seen these wires break at the connector.

CODE PO172 - FUEL SYSTEM RICH BANK 1 CONDITIONS. POSSIBLE CAUSES : 1. BASE ENGINE MECHANICAL FAULT AFFECTING ONE OR MORE CYLINDERS. 2.EVAP SYSTEM COMPONENT HAS FAILED OR CANISTER FUEL SATURATED. 3.FUEL CONTROL SENSOR IS OUT OF CALIBRATION.( ECT IAT MAP ) 4. FUEL SYSTEM SUPPLYING TOO MUCH FUEL AT IDLE SPEED OR AT CRUISE. 5. FUEL INJECTOR(S) IS LEAKING OR STUCK PARTIALLY OPEN. ( ONE OR MORE ) 6. HO2S IS CONTAMINATED DETERIORATED OR IT HAS FAILED.

problem #2 sounds like you need a blower motor resistor.

The iat (intake air temperature) is located on the air filter housing. If its reading high its probably unplugged

PLUG EVERYTHING BACK IN.....
REPLACE THE IAT (INTAKE AIR TEMP SENSOR) AND THE COOLANT SENSOR THEY BOTH WORK AS PART OF THE FUEL CONTROLL SYSTEM
LET ME KNOW HOW IT GOES
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