OBD Guide
ENFRDEESPT

P23F9

Cylinder 8 Injector B Air-Fuel Ratio Imbalance

P23F9 is an OBD-II diagnostic trouble code meaning: Cylinder 8 Injector B Air-Fuel Ratio Imbalance. Common causes: malfunction of fuel injector b of cylinder no. 8, fuel injector clogged. Estimated repair cost: $28–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$28–167 (est.)

Symptoms

  • Check Engine light comes on
  • Unstable engine idling
  • Reduced engine power
  • Increased fuel consumption
  • Jerks when accelerating

Causes

  • Malfunction of fuel injector B of cylinder No. 8
  • Fuel injector clogged
  • Problems with injector wiring or connectors
  • Oxygen sensor malfunction
  • Fuel pressure problems

How to Fix

  1. Check the cylinder No. 8 fuel injector B wiring and connectors for damage or corrosion.
  2. Check cylinder No. 8 fuel injector B for resistance and ensure it is within manufacturer specifications.
  3. Clean or replace the No. 8 cylinder B fuel injector if it is clogged or faulty.
  4. Check the fuel pressure in the system and make sure it is within normal limits.
  5. Check the oxygen sensors and replace them if they are faulty.

Related codes

P23F8P23FAP23FB

Error P23F9 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P23F9 code mean?

P23F9 is an OBD-II diagnostic trouble code that indicates: Cylinder 8 Injector B Air-Fuel Ratio Imbalance

What causes a P23F9 error code?

The most common causes of P23F9 include: Malfunction of fuel injector B of cylinder No. 8; Fuel injector clogged; Problems with injector wiring or connectors; Oxygen sensor malfunction.

How do I fix a P23F9 diagnostic trouble code?

To fix P23F9: Check the cylinder No. 8 fuel injector B wiring and connectors for damage or corrosion.. Check cylinder No. 8 fuel injector B for resistance and ensure it is within manufacturer specifications.. Clean or replace the No. 8 cylinder B fuel injector if it is clogged or faulty.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P23F9?

Yes, but get it checked soon

How much does it cost to fix P23F9?

The estimated repair cost for P23F9 is $28–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat