BMW P112F: Meaning, Symptoms and Fix
BMW P112F points to manifold absolute pressure is too high for the throttle angle on bank 1. You may only see a warning light, but a methodical check helps you avoid replacing good parts.
— Tekin Code
manifold absolute pressure is too high for the throttle angle on bank 1. You may only see a warning light, but a methodical check helps you avoid replacing good parts.
What does P112F mean?
Manifold absolute pressure is too high for the throttle angle on bank 1 The exact wording and test logic can vary by VIN, engine and DME software, so confirm the record in the responsible module.
Code: P112F
Definition: manifold absolute pressure is too high for the throttle angle on bank 1
Module: DME
Variation: VIN / engine / model / module software
Read all modules before clearing the fault. Save the status, frequency and freeze frame; related faults often reveal whether this is the cause or a consequence.
Possible symptoms
• Check-engine light
• Rough or high idle
• Hesitation or limp mode
• Sometimes no noticeable symptom
Possible causes
Start with the simplest, least expensive checks and move to component tests only when the evidence supports them.
• Loose intake duct or vacuum leak
• Contaminated throttle body or poor connector contact
• Crankcase ventilation leak, especially on some N55 applications
• Implausible MAP or MAF signal
• Throttle assembly fault
• DME software or adaptation issue
Diagnosis with OBDThink
OBDThink is an independent BMW diagnostic and coding mobile app and is not affiliated with BMW AG. Use it to read and clear supported faults and view available data; workshop equipment may still be required.
• 1. Run a complete vehicle scan and save all related faults.
• 2. Record fault status, frequency and available freeze frame.
• 3. Inspect the inexpensive, accessible items listed below.
• 4. Compare relevant sensor data with engine state and check wiring or leaks.
• 5. Clear the code only after recording it, reproduce the conditions and rescan.
P112F: confirm definition → save evidence → test simplest cause → verify repair
Do not confuse a stored code with proof that a named component has failed. Compare live data, wiring and related faults before buying parts.
Solutions
• Inspect ducts, hoses and connectors; correct any leak — Low
• Clean only where approved and relearn adaptations with suitable equipment — Low
• Test crankcase ventilation and replace the confirmed failed part — Medium
• Test MAP, MAF and throttle signals before replacing a sensor — Medium
• Have DME software and vehicle-specific measures checked — High
After repair, clear the fault, repeat the conditions in which it was stored and rescan all modules. The repair is verified only if the code stays away and the symptom is gone.
Is it safe to drive?
Stop and investigate promptly if you smell fuel, see overheating, have severe shaking or enter limp mode. Otherwise drive gently only as far as needed for diagnosis.
A careful diagnosis of P112F usually saves time and parts. Record the evidence, fix the confirmed cause and verify the result instead of guessing.