OBD Guide
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P1148

Closed Loop Control Function Bank 1

P1148 is an OBD-II diagnostic trouble code meaning: Closed Loop Control Function Bank 1. Common causes: bank 1 oxygen sensor malfunction, air leaks in the intake manifold. Estimated repair cost: $17–89.

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

Symptoms

  • Increased fuel consumption
  • Unstable engine operation at idle
  • Reduced engine power
  • Check engine light comes on
  • Dips during acceleration

Causes

  • Bank 1 oxygen sensor malfunction
  • Air leaks in the intake manifold
  • Problems with fuel injectors
  • Malfunction of the mass air flow sensor (MAF)
  • Damage to wiring or sensor connectors

How to Fix

  1. Check the condition of the bank 1 oxygen sensor
  2. Examine the system for air leaks
  3. Check the operation of the fuel injectors
  4. Test the mass air flow sensor and its circuit
  5. Inspect the wiring harness and sensor connectors

Related codes

P1138P1158P0172

Error P1148 by Vehicle Brand

NissanVolkswagen

FAQ

What does the P1148 code mean?

P1148 is an OBD-II diagnostic trouble code that indicates: Closed Loop Control Function Bank 1

What causes a P1148 error code?

The most common causes of P1148 include: Bank 1 oxygen sensor malfunction; Air leaks in the intake manifold; Problems with fuel injectors; Malfunction of the mass air flow sensor (MAF).

How do I fix a P1148 diagnostic trouble code?

To fix P1148: Check the condition of the bank 1 oxygen sensor. Examine the system for air leaks. Check the operation of the fuel injectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1148?

Yes, but get it checked soon

How much does it cost to fix P1148?

The estimated repair cost for P1148 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat