P0266 on SEAT
Cylinder 2 Contribution/Balance Fault
P0266 on SEAT vehicles indicates cylinder 2 contribution/balance fault. Au7o has documented this code across 1 SEAT model — most commonly on Leon. P0266 is a generic powertrain code indicating the engine computer detected that cylinder 2 is not contributing its expected share of power, meaning its output is unbalanced compared to the other cylinders. The PCM monitors crankshaft acceleration and fuel/injector behavior per cylinder, and an imbalance here often signals a misfire, fuel-delivery, or mechanical problem specific to cylinder 2. Left unaddressed, this can cause rough running, poor performance, and possible catalytic converter damage. Typical repair costs on SEAT range from $400 to $4,000, depending on the specific model and root cause.
Common Causes of P0266
- •Faulty or clogged fuel injector on cylinder 2
- •Injector wiring or connector fault
- •Ignition fault (coil, plug) causing a cylinder-2 misfire
- •Low compression / mechanical issue (valve, ring) on cylinder 2
- •Vacuum or intake leak affecting that cylinder
- •Contaminated or restricted fuel supply
- •PCM driver circuit fault for that injector
P0266 on SEAT by Model
SEAT Leon(1 issue)
- Leon Mk2 2.0 TDI PD (BKD) Injector Failure2005-2010
The BKD 2.0 TDI Pump-Düse engine in Leon Mk2 (and Golf Mk5, Passat B6, Audi A3 8P) suffers PD injector failure, particularly on long-life servicing. Failure modes: misfire on one cylinder, hard starting, white smoke, sooty exhaust. Often accompanied by cracked cylinder head between #2 and #3 due to local overheating.
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View P0266 across all makes →Frequently Asked Questions
What does P0266 mean on SEAT?▼
P0266 stands for "Cylinder 2 Contribution/Balance Fault." P0266 is a generic powertrain code indicating the engine computer detected that cylinder 2 is not contributing its expected share of power, meaning its output is unbalanced compared to the other cylinders. The PCM monitors crankshaft acceleration and fuel/injector behavior per cylinder, and an imbalance here often signals a misfire, fuel-delivery, or mechanical problem specific to cylinder 2. Left unaddressed, this can cause rough running, poor performance, and possible catalytic converter damage. On SEAT specifically, this code is documented across 1 model.
What causes P0266 on SEAT vehicles?▼
Common causes on SEAT: Faulty or clogged fuel injector on cylinder 2, Injector wiring or connector fault, Ignition fault (coil, plug) causing a cylinder-2 misfire, Low compression / mechanical issue (valve, ring) on cylinder 2, Vacuum or intake leak affecting that cylinder. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0266 on a SEAT?▼
Repair costs on SEAT range from $400 to $4,000, depending on the specific model and root cause.
Which SEAT models have P0266 documented?▼
Au7o has documented P0266 on 1 SEAT model: Leon.