Quick answer
P0098 means Intake Air Temperature Sensor 2 Circuit High (Bank 1). The PCM detected an electrically high input from the second intake- or charge-air-temperature circuit. On a common two-wire thermistor circuit, that often appears as implausibly cold live data and may be caused by an unplugged connector, an open or high-resistance wire, a short to voltage, or a failed sensor. Save the evidence, identify the VIN-specific IAT2 location, compare cold-soak data, then prove the circuit or sensor fault before replacing anything.
P0098 is a circuit clue, not a replacement order. IAT2 can be a stand-alone sensor or one channel inside a MAF, MAP, charge-pressure or humidity sensor. Its location, signal type, fault threshold and substitute value depend on the exact engine and calibration.
What Does the P0098 Code Mean?
The common standardized description is “Intake Air Temperature Sensor 2 Circuit High (Bank 1).” The controller has seen the IAT2 input in its calibrated high-fault region for the required time.
A conventional IAT sensor is a negative-temperature-coefficient thermistor. Its resistance is higher when air is cold and lower when air is warm. The controller's pull-up circuit converts that change into a voltage. An open signal path or disconnected sensor can therefore drive the input high and make scan data look extremely cold.
“Circuit High” does not mean the incoming air is too hot. It describes the electrical signal. Do not publish or apply a universal 5-volt, resistance or temperature threshold: OEM documents show different analog limits, filtering times and even frequency-based sensor designs.
Do not confuse Sensor 2 with Bank 2. P0098 belongs to the Bank 1 IAT2 family; a corresponding Bank 2 high-circuit fault is commonly P00A8. Some scan tools omit Bank 1 from the description, and many engines share one charge-air path rather than having a left and right sensor.
Find the IAT2 Architecture Before Testing
Depending on the engine, IAT2 may be in the air duct, charge pipe, intercooler outlet or intake manifold, or integrated into a MAF, MAP or pressure sensor. Ford calls one application a manifold charge-temperature channel integrated with the MAP sensor; GM and European applications use other packages. The five-character code alone cannot identify the connector, pins or serviceable part.
Common P0098 Symptoms
The Check Engine light may be the only obvious sign because some controllers substitute a default temperature. When the strategy uses IAT2 for fueling, spark, EGR or boost protection, other effects may appear.
P0098 may be current, pending, stored or permanent depending on when the monitor last failed.
A conventional open circuit may display an extreme low or fixed substitute value.
Fueling, timing or boost strategy may become conservative on some applications.
Starting quality or idle may change, although many vehicles continue to run normally.
Incorrect temperature information can alter calculated air density and emissions control.
An active MIL, permanent code or incomplete monitor can affect an emissions inspection.
Common Causes and Vehicle Differences
- An IAT2 connector left unplugged, loose or incompletely latched after air-filter, intake or charge-pipe work.
- An open or high-resistance signal or sensor-ground circuit.
- Corroded, wet, bent, backed-out or spread terminals.
- A harness rubbed through, heat damaged or shorted to reference or battery voltage.
- An internally open IAT2 thermistor or failed digital sensor channel.
- A failed MAF, MAP or charge-pressure assembly when IAT2 is not separately serviceable.
- An exact-application software issue or shared-circuit interaction; a PCM fault is possible but uncommon.
| Architecture example | What it changes in diagnosis |
|---|---|
| Stand-alone IAT2 thermistor | The sensor may be serviceable by itself, but its resistance and pinout remain vehicle-specific. |
| IAT2 integrated with MAP or pressure sensor | One connector may carry pressure, temperature, reference and ground circuits; companion codes matter. |
| IAT2 integrated with MAF or humidity sensor | The data may use a different signal architecture, and the larger assembly may be the service part. |
| Charge-air / intercooler temperature naming | Do not assume every OEM maps the same physical location or label to P0098. |
A service bulletin is not a universal fix. Stellantis documented an application where IAT2 circuit faults could interact with P0196 and software logic. Check bulletins by exact VIN and calibration; do not reflash or replace a module because another model used that remedy.
How Serious Is P0098, and Can You Drive?
If P0098 is the only fault, the MIL is solid and the vehicle runs normally, a short, light-load trip to a safe repair location is generally reasonable. Diagnose it soon, and avoid towing, hard acceleration or sustained boost until the sensor data and related codes are understood.
Stop safely and arrange help if the MIL flashes, the engine misfires severely, stalls or repeatedly will not start, power loss makes traffic unsafe, the engine overheats, a red warning appears, or there is heavy smoke or a strong raw-fuel odor. Those conditions are more urgent than P0098 alone.
How to Diagnose P0098 Step by Step
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Save evidence before clearing
Record stored, pending and permanent DTCs, status, freeze frame and system voltage. Note IAT1, MAP/MAF, reference-voltage and P2199 correlation codes. A single code description is not enough.
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Confirm the exact OEM descriptor
Use the year, VIN, engine and service information to identify Bank 1 IAT2, its component package, connector and signal type. Generic live data may show only one IAT PID; select the supported manufacturer engine-data list when available.
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Compare cold-soak data
After the vehicle has cooled, switch the key on without starting and compare IAT2 with IAT1, ambient temperature and ECT. They need not match exactly, but an extreme fixed reading or large unexplained difference supports a circuit fault. Do not impose one universal allowable spread.
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Inspect the connector and harness
Check the lock, seal, pins and nearby wiring for damage, corrosion, moisture, oil, heat or rubbing. Look closely where the harness follows air ducts, charge pipes, brackets and engine movement. Review any recent intake work.
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Graph data during a careful wiggle test
Watch or record IAT2 while gently moving the connector and accessible harness. A sudden jump may expose poor terminal fit or an intermittent conductor. Keep clear of belts, fans and hot components.
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Test the circuit to OEM specifications
Use a high-impedance digital multimeter and the correct pinout. Check signal, pull-up/reference and sensor ground; test for opens, high resistance and shorts to voltage. Turn the ignition off before continuity or resistance tests. Never ohm-test a powered circuit or bridge a reference wire to ground.
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Test the correct service part
Compare the sensor's resistance or output with the OEM temperature chart. If IAT2 is integrated, follow the assembly procedure rather than ordering a generic stand-alone sensor. Do not use another vehicle's threshold or connector view.
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Verify instead of merely clearing
After the proven repair, clear codes, confirm plausible IAT2 data, complete the OEM drive cycle and rescan for current and pending faults. Permanent DTC behavior is monitor-controlled and may not disappear immediately.
CR MAX is a data and scan tool, not a multimeter. It can show the circuit's reported temperature and DTC evidence on supported vehicles, but it cannot physically measure voltage drop, resistance, continuity, current or terminal tension.
P0098 Repair Paths and Common Mistakes
The correct repair follows the failed test. Typical outcomes include fully seating a connector; repairing a terminal, signal wire or sensor ground; replacing a proven stand-alone IAT2 sensor; replacing the correct integrated MAF/MAP/pressure assembly; or applying exact-VIN software guidance. PCM replacement belongs last, after end-to-end circuit and terminal checks pass.
Avoid these expensive mistakes
- Replacing a sensor because “high” was mistaken for hot air.
- Confusing Sensor 2 with Bank 2 or assuming IAT2 is always after the intercooler.
- Ordering a separate sensor when IAT2 is built into a larger assembly.
- Clearing freeze-frame evidence before recording it.
- Calling the PCM bad before checking connector fit, ground and wiring.
- Cleaning a delicate element with harsh solvent or touching it; use only the OEM-approved method for that sensor.
Watch the Original Chevrolet Example
The retained video discusses P0096, P0097, P0098 and related IAT codes on Chevrolet Cruze and Sonic applications. Use it as a vehicle-family example, not a universal sensor-location or replacement instruction.
Video: Electrical Car Repair LIVE, published October 28, 2019. Always follow the service information for your own VIN.
Using iCarsoft CR MAX for P0098
On supported vehicles, CR MAX can read the engine controller, distinguish stored and pending status, preserve freeze frame, display and graph available IAT1/IAT2, ambient, ECT, MAP/MAF and voltage PIDs, clear codes after repair, and rescan for verification. Full-system scanning can also reveal reference-voltage or communication faults outside the engine module.
Functions vary by make, model, year, ECU, gateway and software. CR MAX does not identify a failed part from P0098 alone, supply a universal pinout, or replace a DVOM and OEM wiring diagram. Standard CR MAX uses a direct 16-pin OBD2 cable; it should not be described as a wireless vehicle interface.
Recommended diagnostic platform for P0098
iCarsoft CR MAX Car Diagnostic Tool
Use supported full-system scanning, DTC status, freeze frame and live-data graphing to preserve evidence and compare the temperature PIDs your vehicle exposes. Confirm the electrical fault with the correct physical test equipment before replacing parts.
Check current price & availability · lifetime software updates via Wi-Fi
View CR MAXCheck compatibility by VINBefore buying: verify coverage using the CR MAX / CR MAX BT vehicle-function list or general function lookup. Keep CR MAX current with the official Wi-Fi update guide.
How Much Does It Cost to Fix P0098?
These are 2026 US planning ranges, not a quote. They are alternative outcomes and should not be added together. IAT2 may be a low-cost stand-alone sensor or one channel inside a more expensive assembly; location, access, diagnosis, tax and calibration can change the total.
| Possible outcome | Typical US range |
|---|---|
| Professional electrical diagnosis | $122–$179 |
| Open-circuit tracing and local wiring repair planning range | $240–$318 |
| Stand-alone IAT sensor replacement, only where separately serviceable | $118–$141 |
| MAP sensor assembly replacement when IAT2 is integrated there | $199–$240 |
| MAF sensor assembly replacement when IAT2 is integrated there | $273–$382 |
| PCM replacement after conclusive testing; programming may be additional | $1,123–$1,193 |
Repair Confirmation and Related Codes
A successful repair produces plausible live data under the same conditions that exposed the fault and allows the OEM monitor to pass. A cleared lamp alone is not proof. Confirm terminal locks, route repaired wiring away from abrasion and heat, then rescan after the required drive cycle.
P0098 Frequently Asked Questions
What does code P0098 mean?
P0098 means the controller detected an electrically high input on the Intake Air Temperature Sensor 2 circuit for Bank 1. It identifies a circuit condition, not a confirmed failed sensor.
Does circuit high mean the intake air is too hot?
No. High describes the electrical input. On a conventional NTC thermistor circuit, an open or disconnected path often appears as implausibly cold temperature data.
Is IAT Sensor 2 the same as Bank 2?
No. Sensor 2 identifies the manufacturer's second intake- or charge-air temperature measurement. P0098 applies to Bank 1; P00A8 is commonly the corresponding Bank 2 high-circuit code.
Can I drive with P0098?
A short, light-load trip is generally reasonable if P0098 is the only fault, the MIL is solid and the vehicle runs normally. Stop if the MIL flashes, the engine misfires or stalls, power loss is unsafe, or another critical warning appears.
Will replacing the IAT sensor always fix P0098?
No. A loose connector, open signal or ground, terminal damage, a short to voltage, an integrated sensor assembly or rare software or controller fault can set P0098. Test the exact circuit first.
How can CR MAX help diagnose P0098?
On supported vehicles, CR MAX can save DTC status and freeze frame, graph available IAT and related live data, clear the code after repair and rescan. A multimeter and OEM wiring information are still required for physical circuit tests.
How do I know the P0098 repair is complete?
Confirm that IAT2 data is plausible, the connector and harness are secure, the OEM monitor completes, and no current or pending code returns. A permanent DTC may remain until the monitor passes.
Technical, product, video and cost references
- SAE J2012 diagnostic trouble-code definitions and Ford 2024/2025 OBD monitor summary.
- Mitsubishi P0098 diagnostic procedure and Stellantis IAT2 Bank 1/Bank 2 bulletin.
- GM engine-diagnostics monitor data, illustrating why exact application thresholds matter.
- Electrical Car Repair LIVE Chevrolet IAT-code video, retained from the original article.
- Official iCarsoft CR MAX product page; current national planning references from RepairPal electrical diagnosis, IAT sensor, MAP sensor, MAF sensor, PCM replacement and the AAA 2026 labor-rate guide.
Disclaimer: This guide is general educational information, not a substitute for the wiring diagram, service procedure and safety instructions for the exact vehicle. Test values, component packaging and functions vary by VIN. Work around moving, hot and high-current components only with appropriate training and equipment.
