P0113 on a Lexus: Causes, Fixes & Repair Cost
🟢 Low severity · drivable
Safe to drive — the engine just reads intake air temperature wrong, which may cause slightly rich running.
What P0113 means on a Lexus
On a Lexus, P0113 means the intake air temperature (IAT) sensor is sending a high-voltage, open-circuit signal. On most Lexus models the IAT sensor is built into the mass air flow (MAF) sensor, so the code usually points to that assembly or its connector. The engine may run slightly rich until it is fixed.
Is P0113 common on Lexuss?
P0113 is common on higher-mileage Lexus models, where the MAF/IAT assembly gets dirty or fails and connector terminals corrode. RX and ES models see this after years of service. It is a sensor fault, not an engine failure.
Commonly reported on: RX, ES, NX, GX.
Symptoms
- Check engine light on
- Slightly rich running or worse fuel economy
- Possible hard starting
- Often no noticeable symptoms
Common causes
- most common: Faulty MAF/IAT sensor assembly
- common: Dirty or contaminated sensor element
- common: Loose or corroded connector
- less common: Damaged wiring to the sensor
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean the MAF/IAT sensor with sensor cleaner | Yes | $10–15 |
| Replace the MAF/IAT sensor assembly | Yes | $90–220 |
| Repair the connector or wiring | Mechanic | $50–150 |
Frequently asked questions
Other common Lexus codes
P0113 on other brands
Looking for the full (non-brand-specific) guide? See the P0113 code page →
Browse all Lexus codes: Lexus hub →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.