P0098
Intake Air Temperature Sensor 2 Circuit High Input
Powertrain Fuel and Air Metering Intake Air Temperature 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The engine computer detected that the intake air temperature sensor 2 is sending a voltage signal that's too high, meaning it's reading the air as colder than it actually is. Think of it like a thermometer stuck on an artificially low reading—the engine adjusts fuel mixture incorrectly based on bad information.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Rich fuel mixture or rough idle
Reduced fuel economy
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors voltage from the IAT sensor 2, which uses a negative temperature coefficient thermistor that changes resistance with air temperature. When voltage exceeds the upper threshold (typically 4.8–5.0V), the ECM interprets this as a sensor circuit fault or sensor malfunction. The sensor should produce a voltage range of 0.5–4.5V under normal operating conditions.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
IAT Sensor 2 Voltage 0.5–4.5V (approximately -40°C to +125°C) >4.8V (open circuit or short to voltage)
Signal Response Time Smooth, gradual voltage changes Erratic or stuck-high readings
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
IAT sensor 2 connector
Inspect and clean the connector pins for corrosion or loose contacts, then reseat firmly.
2
IAT sensor 2 wiring harness
Check for damaged, pinched, or exposed wires that may be shorting to voltage; repair or replace as needed.
3
IAT sensor 2
Remove and replace the sensor if connector and wiring are confirmed good.