OBD Guide
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P21A5

Cylinder 10 Air-Fuel Ratio Imbalance

P21A5 is an OBD-II diagnostic trouble code meaning: Cylinder 10 Air-Fuel Ratio Imbalance. Common causes: clogging or malfunction of the injector of the 10th cylinder, vacuum leak in the area of the 10th cylinder. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Uneven engine operation
  • Increased fuel consumption
  • Power Loss
  • Check Engine light comes on
  • Possible misfires

Causes

  • Clogging or malfunction of the injector of the 10th cylinder
  • Vacuum leak in the area of the 10th cylinder
  • Problems with the oxygen sensor
  • Fuel pump malfunction
  • Damage to the wiring harness to the injector

How to Fix

  1. Check the condition of the injector of the 10th cylinder
  2. Diagnose the system for air leaks
  3. Check the operation of oxygen sensors
  4. Test the fuel pump
  5. Inspect the wiring harness for damage

Related codes

P21A0P21A1P21A2

Error P21A5 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P21A5 code mean?

P21A5 is an OBD-II diagnostic trouble code that indicates: Cylinder 10 Air-Fuel Ratio Imbalance

What causes a P21A5 error code?

The most common causes of P21A5 include: Clogging or malfunction of the injector of the 10th cylinder; Vacuum leak in the area of the 10th cylinder; Problems with the oxygen sensor; Fuel pump malfunction.

How do I fix a P21A5 diagnostic trouble code?

To fix P21A5: Check the condition of the injector of the 10th cylinder. Diagnose the system for air leaks. Check the operation of oxygen sensors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P21A5?

Limited driving only, diagnose soon

How much does it cost to fix P21A5?

The estimated repair cost for P21A5 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat