OBD-II trouble code
P0114: Intake Air Temperature Sensor 1 Circuit Intermittent
SAE J2012 names an intermittent intake-air-temperature sensor 1 circuit. GM publication 12OBDGS2 fails a step greater than 10°C between 100-millisecond samples, 20 failures out of 200.
Quick facts
- System
- Powertrain
- Category
- Sensors / Air Intake
- Severity
- Low severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $120 – $150
- DIY difficulty
- Intermediate DIY
Browse every code in P0100–P0199, or start from the full code library.
What does P0114 mean?
P0114 is Intake Air Temperature Sensor 1 Circuit Intermittent in SAE J2012 APR2002. The reading is not held at the low stop or the high stop. It jumps and recovers. The standard itself has no degree limit for that jump.
GM publication 12OBDGS2, common-section engine diagnostics, describes P0114 as a noisy or erratic intake-air signal or sensor. The change in the intake-air reading between consecutive 100-millisecond samples, multiplied by an intermittent weight factor based on a filtered intake-air value, fails when it is greater than 10°C. The filter is 0.10 times the current reading plus 0.90 times the filtered reading from 100 milliseconds earlier. The count is 20 failures out of 200 samples, one sample every 100 ms. Type B, two trips. The row says the check is continuous. Confirm the calibration uses this common section before treating 10°C as the limit. The weight-factor table is in that publication, so a raw 10°C jump and a weighted 10°C jump are not the same number.
The 1999 Ford PCED section 4 list does not include P0114. A dropout that reaches the self-test stops on that manual is P0112 under 0.2 volt or P0113 over 4.6 volts. GRP09 likewise publishes the hard resistance codes, under 45 ohms and over 163,000 ohms, and does not publish this intermittent row.
A heat gun on the connector is not the 12OBDGS2 test. The test is a sample-to-sample step while the circuit is live. Moving the connector with the ignition on and the engine off will show a step in the intake-air parameter if the terminal is the fault. The engine does not need to run for a thermistor to be powered.
Common causes
- On a 12OBDGS2 calibration, a noisy intake-air signal or sensor whose weighted sample-to-sample change exceeds 10°C
- A connector or terminal that opens for a fraction of a second when it is moved, which is the kind of step a 100-millisecond sample can catch
- A chafed signal wire that touches ground or the reference only while the harness moves
- A sensor that produces the same weighted step after the wiring has been held still, which puts the fault in the element the strategy line includes
- A hard open or a hard short, which belongs to P0113 or P0112 once it stops recovering
Symptoms
- Malfunction indicator lamp with P0114
- On the 12OBDGS2 test, more than 10°C of weighted change between readings taken 100 milliseconds apart
- Twenty such samples inside a 200-sample window
- A parameter that looks steady when the connector is left alone
- No P0114 definition in the 1999 Ford PCED section 4 list
Diagnostic steps
- 1.Confirm the chart uses the 12OBDGS2 intermittent test. If it does not, a 10°C rule is the wrong pass/fail. Ford's 1999 manual and GRP09 use the hard low and high codes instead.
- 2.Record intake-air temperature on a scan tool that can show the fast samples, or compare a datalog. The fail is the change between consecutive 100-millisecond samples after the weight factor, greater than 10°C, 20 times out of 200. A gauge that updates once a second can miss the step the monitor counts.
- 3.Ignition on, engine off. Move the sensor connector and then the harness while watching the parameter. A step that appears only as the connector moves is the terminal. Keep hands clear of the belt and the fan. The fan can start on its own with the key on. Do not aim a heat gun at the connector. Fuel hoses and the battery are in reach, and the publication's test is electrical noise, not a temperature soak.
- 4.Ignition off. Disconnect both ends of the signal wire and measure it end to end, then to ground and to the reference. A joint that voltage-drops only while it is moving will still show up as an unstable resistance if you move it during the ohms check.
- 5.If the weighted step continues with the harness held still and the connector seated, the strategy line includes the sensor. Replace that sensor, not the mass-airflow housing, unless the diagram shows one service part.
- 6.Clear the code and repeat the 100-millisecond watch with the repair in place. Two trips are what the sheet requires for the lamp. A single quiet idle does not close a two-trip Type B test by itself.
- 7.If the reading stops recovering and sits under the hard limit, move to P0112 or P0113 and use that code's chart.
Repair cost
$120 – $150
An intake-air temperature sensor that drops out is about $120 to $150 installed. The published average is a narrow band because the part and the labor are both small.
Estimate your repair
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Open the Repair Cost Estimator with intake air temperature sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.