Engine Repair & Service in Rohnert Park & Sonoma County
Rohnert Park Transmission & Auto Repair provides complete engine repair including diagnostics, tune-ups, exhaust repair, cooling system service, and engine rebuilds by ASE certified technicians with nearly 30 years of experience.
Engine Repair & Diagnostics
When your check engine light comes on or your vehicle starts running rough, accurate diagnosis is the first step toward a lasting repair. At Rohnert Park Transmission & Auto Repair, we use advanced OBD-II scanners and live sensor data analysis to pinpoint the exact cause of engine problems before recommending any work. Our ASE certified technicians have diagnosed and repaired thousands of engines across every major make and model over nearly three decades in Sonoma County.
Common engine repairs include sensor replacement, gasket repairs, oil leak diagnosis, valve cover service, and complete engine overhauls when internal components have worn beyond specification. Whether you're hearing a knock, feeling a misfire, or seeing smoke from the exhaust, we identify the root cause and fix it right the first time with quality OEM-equivalent parts and warranty protection.
For detailed information on our engine diagnostic and repair services, including our step-by-step repair process and common engine problems we solve, visit our dedicated pages:
Engine Tune-Up & Maintenance
Regular engine tune-ups are the most cost-effective way to maintain performance, fuel efficiency, and reliability. A tune-up at Rohnert Park Transmission typically includes spark plug replacement, air filter inspection, fuel system cleaning, ignition system evaluation, and a thorough visual inspection of belts, hoses, and fluid levels. Depending on your vehicle and mileage, we may also recommend additional services such as PCV valve replacement or throttle body cleaning.
Neglected tune-ups lead to reduced fuel economy, rough idling, difficulty starting, and accelerated wear on more expensive components like catalytic converters and oxygen sensors. Most vehicles benefit from a tune-up every 30,000 to 60,000 miles, though vehicles with platinum or iridium spark plugs may go longer. Our technicians check your manufacturer's recommendations and tailor the service to your specific vehicle.
Exhaust System & Catalytic Converter
Your exhaust system does more than reduce noise. It routes harmful emissions away from the cabin, converts toxic gases through the catalytic converter, and plays a critical role in engine performance through proper backpressure management. A failing exhaust system can trigger check engine lights, reduce fuel economy, create loud rumbling sounds, and cause your vehicle to fail a California smog inspection.
We service every component of the exhaust system including the exhaust manifold, catalytic converter, resonator, muffler, exhaust pipes, and oxygen sensors. California has strict CARB requirements for catalytic converter replacement, and we use only CARB-compliant parts to ensure your vehicle passes smog. Catalytic converter theft has become increasingly common in Sonoma County, and we can install replacement converters and advise on theft-prevention strategies.
Cooling System & Radiator Service
Your engine's cooling system prevents overheating by circulating coolant through the engine block, radiator, and heater core. When any component in this system fails, engine temperatures can rise quickly and cause severe internal damage including warped heads, blown head gaskets, and cracked blocks. Sonoma County summers push cooling systems hard, especially during stop-and-go traffic on Highway 101 or climbing mountain roads through the wine country.
We provide complete cooling system diagnostics and repair including radiator service, coolant flushes, thermostat replacement, water pump replacement, hose inspection and replacement, and pressure testing to find leaks. If your temperature gauge is climbing higher than normal, you see coolant puddles under your vehicle, or you smell a sweet antifreeze odor, bring your vehicle in for a cooling system evaluation before a minor issue becomes a major engine repair.
Radiator leak repair, flush, and replacement
Coolant flush, pressure test, and hose inspection
Thermostat, fan, and complete system repair
Water pump inspection and replacement
Bearing, seal, and impeller repair
Fuel System Service
A clean, properly functioning fuel system is essential for engine performance, fuel economy, and emissions compliance. Over time, carbon deposits build up on fuel injectors, intake valves, and combustion chambers, reducing efficiency and causing rough running. Fuel pumps weaken with age, fuel filters become restricted, and fuel pressure regulators can fail, all leading to drivability problems that affect your daily commute.
Our fuel system services include fuel injector cleaning and replacement, fuel pump diagnosis and replacement, fuel filter service, fuel pressure testing, and complete fuel system evaluation. If you are experiencing hesitation during acceleration, poor fuel economy, a sulfur smell from the exhaust, or difficulty starting, your fuel system may need attention. We use professional-grade cleaning equipment and quality replacement parts to restore optimal fuel delivery.
Timing Belt & Engine Components
The timing belt or timing chain synchronizes your engine's crankshaft and camshaft rotation, ensuring valves open and close at precisely the right moment. A broken timing belt on an interference engine causes pistons to strike valves, resulting in bent valves, damaged pistons, and potentially a destroyed engine. This is one of the most critical preventive maintenance items on any vehicle with a timing belt.
Most manufacturers recommend timing belt replacement between 60,000 and 100,000 miles. Because the water pump is located behind the timing belt on many vehicles, we strongly recommend replacing the water pump, tensioner, and idler pulleys at the same time to avoid paying for the same labor twice. Our technicians check your vehicle's specific interval and inspect the belt condition during routine services when accessible.
Related Services & Resources
Related Service Categories
- Transmission Repair & Service
Engine and transmission work hand-in-hand for drivetrain health
- Electrical Repair
Sensors, ignition, and engine control modules
- Heating & AC Service
Cooling system overlap with engine temperature management
Frequently Asked Questions: Engine Repair
How much does engine repair cost in Rohnert Park?
What are the signs my engine needs repair?
How often should I get an engine tune-up?
Why is my engine overheating?
How much does catalytic converter replacement cost?
When should I replace my timing belt?
How often should I flush my coolant?
Is it worth repairing an old engine or should I replace it?
Schedule Your Engine Repair Today
From a simple tune-up to a complete engine rebuild, our ASE certified technicians deliver honest diagnostics and lasting repairs backed by warranty. Family-owned and trusted in Rohnert Park since 1997.
305 Laguna Dr, Rohnert Park, CA 94928Mon-Thu 7:30am-5pm | Fri 7am-4pm