P0099 — Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1

What Does P0099 Mean?

P0099 is a diagnostic trouble code indicating: Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1. This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0099

⚠️ Check Engine Light (MIL) illuminated
⚠️ Intake Air Temperature Sensor 2 signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Poor fuel economy

Common Causes

🔍 Loose or intermittent connection at Intake Air Temperature Sensor 2
🔍 Wire chafing causing intermittent contact
🔍 Intake Air Temperature Sensor 2 failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P0099 mean?

P0099 indicates: Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1. The vehicle's computer has detected that the Intake Air Temperature Sensor 2 is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P0099?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P0099 for extended periods may cause additional problems.

How much does it cost to fix P0099?

Repair costs for P0099 typically range from $30 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and reseat all Intake Air Temperature Sensor 2 connectors
🔧 Repair chafed or damaged wiring in Intake Air Temperature Sensor 2 circuit
🔧 Replace Intake Air Temperature Sensor 2 if failing intermittently

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0099: Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1