1965 MG MGB Problems: 2 Known Issues
1965 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1965 MG MGB has 2 documented known issues, with 1 rated critical. The most serious is Sill and Rocker Rot — the Structural Cancer That Lets the Body Sag ($1,500-$6,000 repair). Across all issues with published estimates, repair costs range from $1,500 to $6,000. DIY maintenance guides at au7o.io.
1965 · All trims · All engines
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All 2 Known Issues
NHTSA Recalls4 recalls
SEAT BELTS:FRONT
WIDESPREAD LACK OF UNDERSTANDING ABOUT THE OPERATION OF WEBBING SENSITIVE AND DUAL SENSITIVE SEAT BELTS HAS LEAD TO NON-USE OF BELTS BY A NUMBER OF OWNERS. SOME BELTS RETRACTORS MAY JAM, BIND OR LOCK. THIS MAY DISCOURAGE THE USE OF THE SAFETY BELTS. CONSEQUENCE OF DEFECT: NON-USE OF SEAT BELTS SUBJECTS OCCUPANTS TO RISK OF INJURY IN EVENT OF AN ACCIDENT OR SUDDEN BRAKING.
FUEL SYSTEM, GASOLINE:CARBURETOR SYSTEM
THE RETAINING SCREWS ON THE FUEL BOWL HAVE THE POTENTIAL TO LOOSEN, ALLOWING SEEPAGE OF GASOLINE FROM THE CARBURETOR.
ELECTRICAL SYSTEM:WIRING
THE OVERDRIVE WIRING HARNESS COULD CHAFE AND CAUSE AN ELECTRICAL SHORT CIRCUIT.
EQUIPMENT:OTHER:LABELS
THE VEHICLE CERTIFICATION LABELS AND VEHICLE IDENDIFICATION NUMBER PLATES MAY NOT HAVE BEEN INSTALLED ON THE INVOLVED VEHICLES. THIS DOES NOT COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 115, "VEHICLE IDENTIFICATION NUMBER-BASIC REQUIREMENTS".
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Frequently Asked Questions
What are the most common MG MGB problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1965 MG MGB has 2 documented issues. The most frequently reported are: Sill and Rocker Rot — the Structural Cancer That Lets the Body Sag, Worn Lever-Arm Dampers Let the Front and Rear Float. Of these, 1 is rated critical and should be addressed promptly.
Is the MG MGB reliable?
The 1965 MG MGB has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Sill and Rocker Rot — the Structural Cancer That Lets the Body Sag. 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 MG MGB problems?
Repair costs for known MG MGB issues range from $1,500 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Sill and Rocker Rot — the Structural Cancer That Lets the Body Sag, typically costs $1,500-$6,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1962-1980 MG MGB Sill and Rocker Rot — the Structural Cancer That Lets the Body Sag?
The MGB is monocoque (unibody), so the rocker/sill assembly is a stressed structural member, not just trim. The factory built the sill as three layers — outer sill skin, inner sill, and the boxed 'castle rail' truss between them — with poor sealing at the seams. Road dirt packs i… Repairs typically run $1,500-$6,000. Severity: high.
What is the 1962-1980 MG MGB Worn Lever-Arm Dampers Let the Front and Rear Float?
The Leyland AKD 3259 manual identifies Armstrong double-acting lever-arm dampers at the front and rear. It says erratic resistance or free body movement requires the damper to be removed, checked and topped up; if fluid does not restore resistance, the damper should be replaced. Severity: medium.
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.