P1259 on Honda
VTEC System Malfunction (Honda)
P1259 on Honda vehicles indicates vtec system malfunction (honda). Au7o has documented this code across 2 Honda models — most commonly on Civic, Prelude. This Honda-specific code indicates a malfunction in the VTEC (Variable Valve Timing and Lift Electronic Control) system, the technology that switches between different camshaft profiles to boost performance at higher RPM. The system uses an oil-pressure-controlled spool valve and a pressure switch to engage VTEC, and the engine computer monitors whether the commanded change in valve operation actually occurs. The code sets when the computer detects that VTEC engagement or oil pressure is not matching expectations. It commonly causes reduced high-RPM power and a check engine light, and is frequently tied to oil level or oil pressure problems. Typical repair costs on Honda range from $20 to $300, depending on the specific model and root cause.
Common Causes of P1259
- •Low engine oil level or low oil pressure
- •Faulty VTEC solenoid or clogged solenoid screen
- •Faulty VTEC oil pressure switch
- •Dirty or degraded engine oil
- •Wiring or connector fault at the VTEC solenoid or switch
- •Sticking VTEC spool valve
- •Faulty engine control module
P1259 on Honda by Model
Honda Civic(1 issue)
- VTEC Solenoid Spool Valve Gasket Oil Leak1996-2005
The VTEC spool valve (solenoid) bolts to the side of the cylinder head and uses oil pressure to actuate variable valve timing. Its rubber sealing gasket hardens and shrinks with age and heat, letting engine oil seep out the side of the head/block. The oil often drips onto the exhaust or subframe, producing a burning-oil smell and slow oil loss. A partially clogged solenoid screen or failed gasket can also intermittently disable VTEC engagement. It is a very common, cheap-to-fix leak that high-mileage D- and K-series owners search when they find oil on the block.
Honda Prelude(1 issue)
- VTEC Solenoid Gasket Oil Leak1993-2001
The VTEC solenoid on H22A and H23A engines in 1993-2001 Preludes develops oil leaks from the solenoid gasket and filter screen. Oil weeps from the solenoid housing onto the back of the engine, creating a mess and potentially dripping onto the exhaust manifold (fire risk in extreme cases). The solenoid gasket hardens with heat cycling and age. The VTEC solenoid screen filter can also clog, preventing proper VTEC engagement. This is a simple and inexpensive repair when caught early.
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View P1259 across all makes →Frequently Asked Questions
What does P1259 mean on Honda?▼
P1259 stands for "VTEC System Malfunction (Honda)." This Honda-specific code indicates a malfunction in the VTEC (Variable Valve Timing and Lift Electronic Control) system, the technology that switches between different camshaft profiles to boost performance at higher RPM. The system uses an oil-pressure-controlled spool valve and a pressure switch to engage VTEC, and the engine computer monitors whether the commanded change in valve operation actually occurs. The code sets when the computer detects that VTEC engagement or oil pressure is not matching expectations. It commonly causes reduced high-RPM power and a check engine light, and is frequently tied to oil level or oil pressure problems. On Honda specifically, this code is documented across 2 models.
What causes P1259 on Honda vehicles?▼
Common causes on Honda: Low engine oil level or low oil pressure, Faulty VTEC solenoid or clogged solenoid screen, Faulty VTEC oil pressure switch, Dirty or degraded engine oil, Wiring or connector fault at the VTEC solenoid or switch. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1259 on a Honda?▼
Repair costs on Honda range from $20 to $300, depending on the specific model and root cause.
Which Honda models have P1259 documented?▼
Au7o has documented P1259 on 2 Honda models: Civic, Prelude.