# P0113 1996 Ford Taurus: IAT Sensor High Input Diagnosis > ClearTheCode — Diagnose P0113 on your 1996 Ford Taurus. Learn common causes, symptoms, and step-by-step fixes for the Intake Air Temperature sensor high input circuit fault. Source: https://clearthecode.com/articles/p0113-ford-taurus-1996-diagnostic-guide Code: P0113 Author: ClearTheCode # P0113 1996 Ford Taurus If your 1996 Ford Taurus is displaying a P0113 diagnostic trouble code, it indicates an issue with the Intake Air Temperature (IAT) sensor circuit. Specifically, P0113 signifies a "high input" from the IAT sensor, meaning the Powertrain Control Module (PCM) is receiving a voltage signal that suggests the intake air is extremely cold, or there's an open circuit in the sensor or its wiring. This can significantly affect engine performance and fuel efficiency. ## What this code means on your 1996 Ford Taurus The P0113 code on your 1996 Ford Taurus points to a problem with the Intake Air Temperature (IAT) sensor circuit. The IAT sensor measures the temperature of the air entering the engine, providing crucial data to the PCM. This information helps the PCM calculate the correct fuel-air mixture and ignition timing for optimal combustion. A "high input" signal typically means the voltage reading from the sensor is above the normal operating range, often interpreted by the PCM as an extremely low (cold) air temperature. This can happen if the sensor itself is faulty, if there's an open circuit in the wiring, or if the connector is damaged. For more general information on this code, visit our [P0113 code reference page](/codes/P0113). ## At a glance: difficulty, repair cost, and diagnostic workflow - **Difficulty Rating:** 5/10 — 4/10 — DIY with OBD-II scanner - **Common Symptoms:** Check engine light (MIL); Rough idle; Poor fuel economy - **Estimated Repair Cost:** $40–$250 (parts + typical shop labor) - **OEM Tooling Required:** Standard OBD-II scanner and hand tools **Diagnostic workflow:** 1. Confirm P0113 with a live scan — note pending vs stored and freeze frame data. 2. Verify reported symptoms: Check engine light (MIL), Rough idle, Poor fuel economy. 3. Inspect wiring/connectors and related sensors before replacing modules. 4. Most likely fixes: Clean or replace MAF sensor. 5. Clear codes and road-test; re-scan after two drive cycles if the monitor must set. See the [P0113 code reference](/codes/P0113) and [topic hub](/hubs/fuel-trim-air-metering) for related guides. ## Symptoms you may notice When your 1996 Ford Taurus triggers a P0113 code, you might experience several noticeable symptoms due to the PCM receiving incorrect air temperature data. The engine's computer will likely enrich the fuel mixture, leading to various performance issues. - **Illuminated Check Engine Light (CEL):** This is the most common and immediate symptom, indicating a fault has been detected. - **Reduced Fuel Economy:** The PCM may command a richer fuel mixture based on the false cold air reading, causing your Taurus to consume more fuel than necessary. The EPA notes that proper engine function is key to good fuel economy. - **Rough Idle or Engine Hesitation:** An overly rich fuel mixture can lead to an unstable idle or a noticeable stumble during acceleration. - **Difficulty Starting (especially when cold):** While the code implies cold air, a faulty sensor might confuse the PCM, making starting harder in certain conditions. - **Black Smoke from Exhaust:** A very rich fuel mixture can result in unburnt fuel exiting the exhaust, visible as black smoke. - **Failed Emissions Test:** Incorrect fuel metering dueating to the IAT sensor issue can cause your vehicle to exceed emissions standards. ## How to verify and confirm the issue Verifying a P0113 code on your 1996 Ford Taurus involves a systematic approach to pinpoint the exact cause. This includes using an OBD-II scanner, visual inspections, and specific component tests. ### Scanner codes to check * **Primary DTC:** Confirm P0113 is present. Check if it's a pending, current, or history code. * **Related Codes:** Look for other codes that might be present, such as P0112 (IAT sensor low input), P0111 (IAT sensor range/performance), or any Mass Air Flow (MAF) sensor codes (P0100-P0104) as these systems are often related. Also, check for fuel trim codes like P0171 or P0174 (lean conditions) which could be a secondary effect if the PCM overcompensates. ### Live data / freeze frame checks * **IAT Sensor Reading:** With the engine cold and off, the IAT sensor reading on your scanner should be very close to the ambient air temperature. If it reads an extremely low temperature (e.g., -40°F or -40°C) or a fixed high value, it confirms a sensor or circuit issue. * **Engine Coolant Temperature (ECT) Sensor Reading:** Compare the IAT reading to the ECT sensor reading when the engine is cold. They should be similar. * **Fuel Trims (STFT & LTFT):** Monitor short-term and long-term fuel trims. A P0113 often leads to the PCM commanding a rich mixture, which might cause the fuel trims to go negative as the system tries to compensate. ### User inspections and simple tests * **Visual Inspection:** Locate the IAT sensor (often in the intake manifold or air intake tube). Inspect the sensor and its wiring harness for any visible damage, frayed wires, or corrosion at the connector. Ensure the connector is securely seated. * **Clear Codes and Retest:** After a visual inspection, clear the P0113 code and drive the vehicle through a complete drive cycle. See if the code returns. * **Multimeter Test:** Disconnect the IAT sensor and use a multimeter to measure the resistance across its terminals. Compare this reading to the resistance values specified in your Ford Taurus service manual for various temperatures. An open circuit (infinite resistance) or a reading far outside the expected range confirms a faulty sensor. ### Confirmatory part tests or replacements * **IAT Sensor Replacement:** If visual inspections and multimeter tests point to a faulty sensor, replacing the IAT sensor is the most direct confirmatory test. After replacement, clear the codes and monitor the IAT live data. If the readings are now accurate and the P0113 code does not return after a drive cycle, the sensor was the issue. ## Common causes (most likely first) Understanding the common culprits behind a P0113 code can help streamline your diagnostic process for your 1996 Ford Taurus. * **Faulty Intake Air Temperature (IAT) sensor:** This is the most frequent cause. The sensor itself can fail internally, sending an incorrect high voltage signal to the PCM. * **Open circuit in the IAT sensor wiring:** A broken wire or a poor connection in the circuit leading to or from the IAT sensor can cause the PCM to interpret an open circuit as a very cold temperature, triggering the high input code. * **Corroded or loose IAT sensor connector:** Over time, the electrical connector to the IAT sensor can become corroded or loose, leading to intermittent or complete loss of signal. * **PCM (Powertrain Control Module) fault:** While less common, a malfunctioning PCM could incorrectly interpret the IAT sensor's signal or have an internal fault in the IAT circuit. This should only be considered after ruling out all other possibilities. ### Related guides on this vehicle - [P0003 2027 Ford Flex: Diagnosis & Fixes for Fuel System Fault](/articles/p0003-ford-flex-2027-diagnostic-guide) - [P0011 2024 Lexus Gx: Intake Camshaft Timing Over-Advanced](/articles/p0011-lexus-gx-2024-diagnostic-guide) - [P0012 2027 Acura Rdx: Intake Camshaft Position - Timing Over-Retarded](/articles/p0012-acura-rdx-2027-diagnostic-guide) ## Step-by-step diagnosis Follow these steps to diagnose the P0113 code on your 1996 Ford Taurus: 1. **Connect an OBD-II Scanner:** Plug in your scanner and check for the P0113 code. Note any other related codes that may be present. 2. **Review Freeze Frame Data:** Examine the freeze frame data associated with the P0113 code. This data captures engine conditions (RPM, engine load, coolant temp, IAT) at the moment the code was set, providing valuable clues. 3. **Inspect IAT Sensor and Wiring:** Visually check the IAT sensor, its electrical connector, and the wiring harness for any signs of damage, corrosion, or loose connections. Ensure the sensor is properly seated. 4. **Test IAT Sensor Resistance:** Disconnect the IAT sensor. Using a multimeter, measure the resistance across the sensor's terminals. Compare this reading to the manufacturer's specifications for your 1996 Ford Taurus at the current ambient temperature. An open circuit (infinite resistance) or a reading significantly out of spec indicates a bad sensor. 5. **Check Wiring Continuity:** If the sensor tests good, check the continuity of the IAT sensor's signal and ground wires from the sensor connector back to the PCM connector. Look for any open circuits or shorts to ground/power. 6. **Check Reference Voltage:** With the key on and engine off, use a multimeter to check for the 5-volt reference signal at the IAT sensor connector (if applicable for your model). 7. **Consider PCM:** If all sensor and wiring tests pass, and the code persists, a PCM fault might be suspected, though this is rare. Consult a professional for PCM diagnosis. ## Repair and fix options Once you've diagnosed the root cause of the P0113 code on your 1996 Ford Taurus, the repair options are typically straightforward: * **Replace the Intake Air Temperature (IAT) sensor:** If your tests confirm the sensor is faulty, replacing it is usually a simple and effective fix. Ensure you get the correct part for your 1996 Ford Taurus. * **Repair damaged wiring or connector:** If you find any frayed, broken, or corroded wires or a damaged connector, repair or replace the affected section of the harness. Ensure all connections are clean and secure. * **Clean corrosion from connector pins:** If corrosion is present on the IAT sensor connector pins, carefully clean them using an electrical contact cleaner and a small brush. Reconnect securely. After any repair, clear the DTCs from the PCM and perform a test drive to ensure the P0113 code does not return and that the engine is operating normally. This helps confirm the repair was successful. ## When to see a professional While many P0113 diagnoses and repairs can be handled by a DIY mechanic, there are times when consulting a professional is advisable. If you've performed the basic diagnostic steps and are still unable to pinpoint the issue, or if the code persists after attempting repairs, a qualified technician can offer specialized tools and expertise. Complex electrical diagnostics, especially those involving the PCM, are best left to professionals. Additionally, if you notice other severe symptoms like significant engine misfires or stalling, it's safer to have a professional diagnose the issue to prevent further damage. For a comprehensive list of diagnostic guides, you can browse our [articles](/articles). ## Frequently asked questions ### Can I drive with a P0113 code? While you can technically drive your 1996 Ford Taurus with a P0113 code, it's not recommended for extended periods. The incorrect IAT sensor reading can cause the engine to run rich, leading to reduced fuel economy, increased emissions, and potentially long-term damage to components like the catalytic converter. It's best to diagnose and fix the issue promptly. ### Where is the IAT sensor located on a 1996 Ford Taurus? On a 1996 Ford Taurus, the Intake Air Temperature (IAT) sensor is typically integrated into the Mass Air Flow (MAF) sensor assembly, which is located in the air intake tube between the air filter box and the throttle body. In some cases, it might be a separate sensor located directly in the intake manifold or air intake ducting. Consult your vehicle's service manual for the exact location. ### How does the IAT sensor affect fuel economy? The IAT sensor provides critical air temperature data to the PCM, which uses this information to calculate the correct fuel-air mixture. If the IAT sensor reports an inaccurately low (cold) temperature, the PCM will command a richer fuel mixture, similar to a choke on an older engine. This excess fuel leads to reduced fuel economy, as noted by the EPA's focus on efficient vehicle operation, and can increase harmful emissions. For more on how air metering affects your vehicle, explore our [fuel trim and air metering hub](/hubs/fuel-trim-air-metering). ## Sources and further reading Information regarding vehicle emissions and fuel economy, including the importance of properly functioning sensors like the IAT, is extensively covered by the U.S. Environmental Protection Agency (EPA). Their FuelEconomy.gov website provides valuable insights into how vehicle systems impact fuel efficiency and environmental performance. The EPA's Office of Transportation and Air Quality (OTAQ) also publishes research and guidelines on vehicle emissions and related topics, emphasizing the role of accurate sensor data in maintaining optimal engine operation and reducing environmental impact. This information is for educational purposes only and is not a substitute for OEM service procedures or the advice of a qualified technician. Always consult a qualified technician for safety-critical work or complex diagnostics. You can also browse all [OBD-II codes](/codes) for more information.