OBD Guide
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P120A

Secondary Fuel Injector Bank 1 Insufficient Flow

P120A is an OBD-II diagnostic trouble code meaning: Secondary Fuel Injector Bank 1 Insufficient Flow . Common causes: secondary injector is dirty or clogged, problems with the fuel pump or pressure regulator. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine operation
  • Power reduction
  • Increased fuel consumption
  • Dips during acceleration
  • Check Engine Light Illuminates

Causes

  • Secondary injector is dirty or clogged
  • Problems with the fuel pump or pressure regulator
  • Open or short circuit in the injector circuit
  • Engine control unit malfunction
  • Fuel filter dirty

How to Fix

  1. Check the condition of the fuel filter and replace if necessary
  2. Clean or replace secondary fuel injector
  3. Check the pressure in the fuel system
  4. Check the integrity of the injector circuit and connectors
  5. Test the operation of the engine control unit

Related codes

P120BP1209P0201

FAQ

What does the P120A code mean?

P120A is an OBD-II diagnostic trouble code that indicates: Secondary Fuel Injector Bank 1 Insufficient Flow

What causes a P120A error code?

The most common causes of P120A include: Secondary injector is dirty or clogged; Problems with the fuel pump or pressure regulator; Open or short circuit in the injector circuit; Engine control unit malfunction.

How do I fix a P120A diagnostic trouble code?

To fix P120A: Check the condition of the fuel filter and replace if necessary. Clean or replace secondary fuel injector. Check the pressure in the fuel system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P120A?

Yes, but get it checked soon

How much does it cost to fix P120A?

The estimated repair cost for P120A is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat