1991 Porsche 911
Recalls, most-reported problems, crash-test ratings, fuel economy and what a 1991 Porsche 911 is worth — from official NHTSA and EPA data. 2 on record.
1991 Porsche 911 at a glance
Included: that car's specs and build sheet, model-year recall campaigns and a fair price.
1991 Porsche 911 recalls 4
A PART OF THE STEERING COLUMN UPPER UNIVERSAL JOINT CRACKED DURING THE MANUFACTURING PROCESS.
Fix: DEALERS WILL INSPECT THE UNIVERSAL JOINT FOR CRACKS AND WILL REPLACE CRACKED JOINTS WITH NEW PARTS.
AFTER THE ENGINE HAS BEEN TURNED OFF, THE REAR HEATER WILL AUTOMATICALLY OPERATE IN ORDER TO DISSIPATE HEAT IN THE ENGINE HEATING SYSTEM. DURING THIS OPERATION, THE RESISTOR FOR THE REAR HEATER BLOWER CAN BECOME OVERLOADED DUE TO A BINDING OR SEIZED REAR HEATER BLOWER.
Fix: PORSCHE DEALERS WILL INSTALL A NEW RESISTOR CONTAINING A CIRCUIT BREAKER.
THE HYDRAULIC BRAKE PRESSURE REDUCTION VALVE CAUSES THE RATE OF HYDRAULIC PRESSURE REDUCTION TO SLOW DOWN, WHICH MAY RESULT IN THE REAR WHEELS LOCKING-UP EVEN WITH THE ANTI-LOCK BRAKE SYSTEM IN OPERATION.
Fix: PORSCHE DEALERS WILL INSTALL A MODIFIED HYDRAULIC BRAKE PRESSURE REDUCTION VALVE.
THE BALL SOCKETS ON THE CRUISE CONTROL LINKAGE CAN BREAK, ALLOWING THE CRUISE CONTROL LINKAGE TO BECOME DETACHED ON ONE END AND JAM ON NEARBY COMPONENTS, WHICH COULD IMPAIR THROTTLE PLATE OPERATION.
Fix: REPLACE THE CURRENT PLASTIC BALL SOCKETS WITH A NEW LINKAGE USING STEEL BALL SOCKETS, AND LUBRICATE THE CRUISE CONTROL RELAY LEVER. OWNERS ARE ADVISED NOT TO USE THE CRUISE CONTROL UNTIL THE MODIFICATION IS INSTALLED.
Source: U.S. NHTSA, checked 4 Nov 2026. A campaign covers the model year; to see whether a particular car still needs the repair, check its VIN on NHTSA.gov or ask a franchised dealer.
1991 Porsche 911 common problems
The most-reported problem areas across all 1 owner complaint filed with NHTSA — and what to check before you buy.
Dimensions & weight
Manufacturer-reported figures for the 1991 Porsche 911 — ranges cover the 4 body / drivetrain versions on record. Source: Transport Canada vehicle specifications via NHTSA.
Investigations & service bulletins
Manufacturer service bulletins 92
Technical notes the manufacturer sent to dealers about known issues and fixes. Useful to mention to a mechanic — they are not recalls and repairs may not be covered. Showing the 10 most recent of 92.
Special tools and equipment information for the Boxster, Cayman, 911, and Panamera
Bulletin No. 2404 · Equipment, Power Train · Mar 2024Information for PIWIS tester update 42.300.050 & .052
Bulletin PIWIS2302s · Equipment · Nov 2023Instructions on manufactures certificate for approved Porsche C30 engine oils
Bulletin No. 33-23 · Equipment · Nov 2023Instructions on manufactures certificate for approved Porsche A40 engine oils
Bulletin No. 35-23 · Equipment · Nov 2023Instructions on manufacturers certificate for approved C20 engine oils
Bulletin No. 32-23 · Equipment · Nov 2023Information for PIWIS tester update 42.300.040 & .041
Bulletin PIWIS2302r · Equipment · Nov 2023Information for PIWIS tester update 42.300.035
Bulletin PIWIS2302q · Equipment · Nov 2023Information for PIWIS tester update 42.300.030 - .032
Bulletin PIWIS2302p · Equipment · Nov 2023Parts information for parts withdrawal involving the glass roof - 9J0877069EY and 9J0877069DY
Bulletin No. D654 · Equipment · Nov 2023Special tools and equipment information on PIWIS tester update 42.250.050
Bulletin PIWIS2302h · Equipment · Oct 2023Source: NHTSA Office of Defects Investigation, listed for the 911. Model-year data, not specific to one car.
About the Porsche 911
The Porsche 911 model series is a family of two-door, high performance rear-engine sports cars, introduced in September 1964 by Porsche of Stuttgart, Germany, and now in its eighth generation. All 911s have a rear-mounted flat-six engine, and usually 2+2 seating, except for special 2-seater variants. Originally, 911s had air-cooled engines, and torsion bar suspension, but the 911 has been continuously changed and improved across generations. Though the 911 core concept has remained largely unchanged, water-cooled engines were introduced with the 996 series in 1998, and front and rear suspension have been replaced by Porsche-specific MacPherson suspension in the front, and independent multi-l…
From Wikipedia, licensed CC BY-SA 4.0. Describes the model line in general, not this model year specifically.