P219F on Audi
Cylinder 4 Air/Fuel Ratio Imbalance
P219F on Audi vehicles indicates cylinder 4 air/fuel ratio imbalance. Au7o has documented this code across 3 Audi models — most commonly on A4, Q5, SQ5. Generic SAE J2012 code. Sets when the PCM detects an air/fuel ratio imbalance in cylinder 4, running too rich or too lean versus the other cylinders on the bank. Detection uses the heated exhaust oxygen / air-fuel sensors along with crank and cam position inputs. A sustained rich condition can overheat the catalytic converter and a sustained lean condition can raise combustion temperatures, so it should be corrected.
Common Causes of P219F
- •Worn or fouled spark plug on cylinder 4
- •Weak or failing ignition coil on cylinder 4
- •Clogged or leaking fuel injector on cylinder 4
- •Unmetered air leak (intake manifold gasket, vacuum hose, throttle body gasket)
- •Faulty upstream oxygen / air-fuel ratio sensor
- •Contaminated MAF sensor
- •Fuel pressure/delivery problems
P219F on Audi by Model
Audi A4(1 issue)
- 2009-2021 A4 2.0T Gasoline-Quality Deposit Diagnosis - TSB 2014753/132009-2021
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits on intake valves, the intake manifold, fuel injectors and combustion chambers. Possible results include rough running after cold start, extended cranking, hesitation, rough idle, reduced performance, poor fuel economy or an MIL with supported misfire, lean-system or cylinder-imbalance faults. This does not establish a universal A4 2.0T intake-valve defect, mandatory walnut-blasting interval or fixed failure mileage.
Audi Q5(1 issue)
- 2009-2025 Q5 Gasoline-Quality Deposit Diagnosis - TSB 2014753/132009-2025
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits on intake valves, the intake manifold, fuel injectors and combustion chambers. Possible results include rough running after cold start, extended cranking, hesitation, rough idle, reduced performance, poor fuel economy or an MIL with misfire, lean-system or air/fuel-ratio-imbalance faults. This does not establish a universal Q5 intake-valve defect, a mandatory walnut-blasting interval or a fixed failure mileage.
Audi SQ5(1 issue)
- Fuel-Quality or Deposit-Related Rough Running and Misfire Diagnosis2014-2025
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits in injectors, combustion chambers, the intake manifold and intake valves, with rough running, hesitation, reduced performance, poor fuel economy or related ECM faults. This does not establish a universal SQ5 intake-valve defect, a mandatory walnut-blasting interval or a fixed mileage. Audi separately warns that unapproved fuel additives are not permitted on 2018-2025 EA839 V6 TFSI SQ5 models because a negative effect on engine life cannot be ruled out.
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View P219F across all makes →Frequently Asked Questions
What does P219F mean on Audi?▼
P219F stands for "Cylinder 4 Air/Fuel Ratio Imbalance." Generic SAE J2012 code. Sets when the PCM detects an air/fuel ratio imbalance in cylinder 4, running too rich or too lean versus the other cylinders on the bank. Detection uses the heated exhaust oxygen / air-fuel sensors along with crank and cam position inputs. A sustained rich condition can overheat the catalytic converter and a sustained lean condition can raise combustion temperatures, so it should be corrected. On Audi specifically, this code is documented across 3 models.
What causes P219F on Audi vehicles?▼
Common causes on Audi: Worn or fouled spark plug on cylinder 4, Weak or failing ignition coil on cylinder 4, Clogged or leaking fuel injector on cylinder 4, Unmetered air leak (intake manifold gasket, vacuum hose, throttle body gasket), Faulty upstream oxygen / air-fuel ratio sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P219F on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have P219F documented?▼
Au7o has documented P219F on 3 Audi models: A4, Q5, SQ5.