P0114 Code: Intake Air Temperature Sensor 1 Circuit Intermittent
The IAT signal keeps dropping out or jumping for a moment and coming back, a sign of a loose connection.
At a glance
Severity: Minor
- Meaning
- Intake Air Temperature Sensor 1 Circuit Intermittent
- System
- Fuel & Air Metering · Powertrain
- Safe to drive?
- Yes, short term
- Typical repair cost
- $0–$450
- DIY difficulty
- Easy
Air temperature in the intake changes slowly; even a hard climb up a grade rarely moves it more than a few degrees per second. P0114 sets when the PCM sees the IAT signal jump or drop out faster than air could ever change temperature, then return to normal. That pattern nearly always means a connection that makes and breaks: a spread terminal, a wire broken inside its insulation near the plug, corrosion that only conducts when damp, or a cracked solder joint in the sensor. Because the fault is only present some of the time, the sensor usually tests fine on the bench, and the code may sit as pending for a while before the check engine light comes on.
Can I keep driving? Safe to drive. At most you may feel a brief hesitation when the reading jumps; the bigger nuisance is that the light can keep coming back and get in the way of an emissions test.
How to read P0114
- P Powertrain
- 0 Generic (SAE)
- 1 Fuel & air metering
- 14 Specific fault
Symptoms
- Check engine light that comes and goes
- Pending code with no noticeable change in how the car drives
- Brief stumble that lines up with a jump in the IAT reading
- Fault shows up after rain, a car wash or on rough roads
- Recorded IAT data with sudden spikes to -40°F or to the maximum
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Loose or spread terminals in the IAT or MAF connector
- Wire broken inside its insulation near the connector, where the harness flexes with engine movement
- Moisture or corrosion that disturbs contact only when wet
- Cracked solder joint or internal fault in the sensor
- Harness rubbing on a bracket or air box edge and shorting momentarily
- Poor splice from an earlier repair or accessory installation
Diagnosis step by step
Read freeze frame and history
The freeze frame shows engine speed, road speed and what IAT read when the fault latched. A code that sets at highway speed on broken pavement points at a flexing harness; one that sets on the first start after a rainy night points at moisture.
Tools: OBD-II scanner
Graph IAT while flexing the wiring
With the engine idling, graph IAT at the fastest sample rate your scanner allows and flex the connector and harness a few inches at a time. A spike or dropout that repeats at the same spot marks the fault; a single-value PID display is too slow to catch it.
Tools: OBD-II scanner
Let engine movement do the flexing
With your foot firmly on the brake and the area clear, have a helper shift between Drive and Reverse a few times while you watch the graph. The engine rocks on its mounts and stretches the harness the way hard acceleration does.
Tools: OBD-II scanner
Check terminal grip
Unplug the connector and slide a matching male terminal into each female terminal. It should drag with noticeable tension; one that slips in loosely won't hold contact under vibration and needs replacing, not just cleaning.
Tools: Flashlight, Pliers
Try heat and moisture
Warm the sensor and connector gently with a hair dryer, then mist the connector with a spray bottle, never a hose, while graphing. A reading that jumps with heat or water pinpoints a cracked joint or a leaky seal.
Tools: OBD-II scanner
Repair it properly
Replace a loose terminal or a pigtail with a soldered, heat-shrunk joint rather than squeezing terminals with pliers. Clear the code and confirm over several days that it doesn't return, since one quiet drive proves very little with an intermittent fault.
Tools: Pliers
Where the parts are
- 1MAF sensor
- 2Turbocharger
- 3Throttle body
- 4Intake manifold
- 5Fuel injector
- 6EGR valve
- 7Fuel pump
- 8Thermostat
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Clean and seal the connector | Yes | $0–$40 |
| Replace terminals or connector pigtail | Yes | $20–$150 |
| Repair wire broken at the flex point | No | $80–$250 |
| Replace standalone IAT sensor | Yes | $25–$120 |
| Replace MAF sensor with integrated IAT | Yes | $150–$450 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Emissions / smog test impact
Depends
Whether the car passes depends on timing: with P0114 only pending and the light off, the OBD-II check can pass if the monitors are ready, but once the light is on it fails. Clearing the code just before the test resets the monitors, which most states also reject.
Frequently asked questions
Why does P0114 keep coming back after I clear it?
Clearing only erases the record; the loose connection is still there. As soon as the right bump, vibration or moisture comes along, the signal drops out again and the code returns.
Should I just replace the IAT sensor?
Not as a first move. Connectors and wires cause most intermittent IAT faults, and a new sensor plugged into the same worn terminals will do the same thing. Do the flex and terminal tests before buying one.
Why does it only happen when it rains?
Water getting past a cracked connector seal or a split in the insulation can create a temporary leakage path or disturb a marginal contact. Once the engine bay dries out, the circuit works again and the fault disappears.
Can P0114 affect engine performance?
Only a little. Each dropout makes the PCM use a wrong temperature for a moment, which can cause a brief stumble, but it quickly switches to a default value. The main consequences are the check engine light and a failed emissions test.