P0103 Code - Mass or Volume Air Flow Circuit High Input

What Does P0103 Mean?

The troublecode P0103 is set when the MAF sensor signal is consistently high. This code, unlike P0102, is not often encountered.

When diagnosing MAF sensor codes, understanding fuel trims is very important. Please see the fuel trims article (P0171):

Fuel Trims – Lean

Identifying the type of MAF sensor in your car will also aid diagnosis. There are a number of different MAF sensors including the most common hot-wire sensors. The following Youtube video describes vane, analog or digital hot-wire, and vortex MAF sensors:



Note: Circuit High Input codes are mostly caused by defective alternators that develop excessive voltages, although there may be other causes as well, such as short circuits that “leak” current into a particular system from other, unrelated systems that work on higher voltages. Note that in the case of short circuits that leak power into a control circuit, there is likely to be other, seemingly unrelated trouble codes present along with the code(s) being investigated. Diagnosing a “high input” code will always involve a thorough testing of the charging system as a first step, followed by measures to isolate the system from all other possible sources of power during resistance, continuity, and reference voltage tests.

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obd code P0103	obd2 P0103	P0103 car code	diagnostic code P0103
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codigo P0103	codigo falla P0103	P0103 kody błędów	codigo de falla P0103

What are the common causes of P0103?

• Faulty IMRC actuator relay (if equipped)
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• An air leak forward of the DPF will change the sensor readings resulting in the code

How do you troubleshoot P0103?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the P0103 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.

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