When P0110 + P0120 appear together, the issue typically affects air intake temperature measurement and throttle position monitoring.
These two sensors directly influence fuel injection calculations and throttle response. Incorrect signals can trigger limp mode and unstable engine behavior.
Understanding P0110 + P0120 helps avoid unnecessary throttle body replacement.
P0110 – Intake Air Temperature Circuit
The IAT sensor measures incoming air temperature. The ECU adjusts fuel mixture density accordingly.
Fault triggers include:
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Open circuit
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Short to ground
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Implausible temperature reading
P0120 – Throttle Position Circuit
The throttle position sensor monitors throttle plate angle.
Common triggers:
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Signal interruption
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Voltage mismatch
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Mechanical throttle contamination
Professional Diagnostic Procedure
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Check 5V reference supply
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Verify ground continuity
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Monitor live data voltage output
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Perform throttle relearn procedure
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Inspect intake contamination
Advanced diagnostic tutorials:
https://diagnozabam.ro
Engineering reference:
https://www.sae.org
Estimated Repair Costs (EU)
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IAT sensor: €20–€70
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Throttle cleaning: €30–€80
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Complete throttle body: €150–€400
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Wiring repair: €30–€100
Final Verdict
The combination of P0110 + P0120 signals intake and throttle control disruption.
In many cases, electrical faults or contamination are responsible — not catastrophic engine damage.
Systematic diagnosis ensures accurate repair and prevents unnecessary expenses.
✍️ Author: Bejenaru Alexandru Ionut – [email protected]
🔗 Internal link: https://diagnozabam.ro/sfaturi
