2002 Toyota Sienna Problems: 1 Known Issue
2002 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated November 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2002 Toyota Sienna has 1 documented issue, with 1 rated critical. The most serious is 1MZ-FE 3.0L V6 Oil Gelling (Engine Sludge) from PCV/Oil-Return Restriction ($900-$5,500 repair). Across all issues with published estimates, repair costs range from $900 to $5,500. DIY maintenance guides at au7o.io.
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All 1 Known Issue
NHTSA Recalls4 recalls
STRUCTURE
TOYOTA IS RECALLING CERTAIN MODEL YEAR 1998 THROUGH 2010 SIENNA PASSENGER VEHICLES MANUFACTURED BETWEEN AUGUST 7, 1997 AND JANUARY 4, 2010, CURRENTLY REGISTERED IN OR ORIGINALLY SOLD IN CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, KENTUCKY, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WASHINGTON DISTRICT OF COLUMBIA, VIRGINIA, WEST VIRGINIA, AND WISCONSIN. THE SUBJECT VEHICLES ARE EQUIPPED WITH THE SPARE TIRE STOWED UNDER THE VEHICLE. IF THE VEHICLE IS OPERATED IN THE COLD CLIMATE REGIONS OF THE UNITED STATES WHERE ROAD SALT IS FREQUENTLY USED, WATER SPLASHED BACKWARDS WITH HIGH CONCENTRATIONS OF ROAD SALT CAN REACH THE SPARE TIRE CARRIER AND CORRODE THE SPARE TIRE CARRIER ASSEMBLY CABLE.
STRUCTURE:FRAME AND MEMBERS
VEHICLE DESCRIPTION: PASSENGER VEHICLES. THE FRONT SUB FRAME ASSEMBLY HAS NOT BEEN ADEQUATELY WELDED.
ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:CONTROL MODULE
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES, MINI VANS AND PASSENGER VEHICLES EQUIPPED WITH A THEFT DETERRENT SYSTEMS (TDS) SUPPLIED BY AUDIOVOX CORPORATION AND DISTRIBUTED BY SOUTHEAST TOYOTA DISTRIBUTORS, INC. IN THE STATES OF ALABAMA, FLORIDA, GEORGIA, NORTH AND SOUTH CAROLINA. THE ALARM WIRING HARNESS PLUGS INTO THE VEHICLE'S IGNITION SWITCH AND THE VEHICLE'S IGNITION SWITCH WIRING HARNESS PLUGS INTO THE ALARM HARNESS TO COMPLETE THE CIRCUIT. A PERCENTAGE OF THE FEMALE TERMINALS USED IN THE ALARM CONNECTOR WERE FOUND TO BE DEFECTIVE, CAUSING AN 'OPEN CIRCUIT' CONDITION WHEN MATED TO THE MALE IGNITION SWITCH TERMINALS.
ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:CONTROL MODULE
EQUIPMENT DESCRIPTION: AFTERMARKET THEFT DETERRENT SYSTEMS USED ON 1998-1998 TOYOTA RAV4, AVALON, AND SIENNA MODEL VEHICLES DISTRIBUTED BY SOUTHEAST TOYOTA DISTRIBUTORS, INC. IN THE STATES OF ALABAMA, FLORIDA, GEORGIA, NORTH AND SOUTH CAROLINA. THE ALARM WIRING HARNESS PLUGS INTO THE VEHICLE'S IGNITION SWITCH AND THE VEHICLE'S IGNITION SWITCH WIRING HARNESS PLUGS INTO THE ALARM HARNESS TO COMPLETE THE CIRCUIT. A PERCENTAGE OF THE FEMALE TERMINALS USED IN THE ALARM CONNECTOR WERE FOUND TO BE DEFECTIVE, CAUSING AN "OPEN CIRCUIT" CONDITION WHEN MATED TO THE MALE IGNITION SWITCH TERMINALS.
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Frequently Asked Questions
What are the most common Toyota Sienna problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2002 Toyota Sienna has 1 documented issue. The documented issue is: 1MZ-FE 3.0L V6 Oil Gelling (Engine Sludge) from PCV/Oil-Return Restriction. Of these, 1 is rated critical and should be addressed promptly.
Is the Toyota Sienna reliable?
The 2002 Toyota Sienna has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: 1MZ-FE 3.0L V6 Oil Gelling (Engine Sludge) from PCV/Oil-Return Restriction. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Toyota Sienna problems?
Repair costs for known Toyota Sienna issues range from $900 to $5,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 1MZ-FE 3.0L V6 Oil Gelling (Engine Sludge) from PCV/Oil-Return Restriction, typically costs $900-$5,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1998-2003 Toyota Sienna 1MZ-FE 3.0L V6 Oil Gelling (Engine Sludge) from PCV/Oil-Return Restriction?
First-generation XL10 Siennas built with the 3.0L 1MZ-FE V6 are part of Toyota's well-documented oil-gelling population. Restricted crankcase ventilation and undersized oil drain-back passages let oil oxidize into a gel that blocks the pickup screen and oil galleries. Owners repo… Repairs typically run $900-$5,500. Severity: high.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.