There are 9 stored owner reports matching the engine leading-label group for the 1991 Geo Prizm in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 9 of 9 matching reports.
Open the full vehicle complaint log (all categories)TL*THE CONTACT OWNS A 1991 GEO PRIZM. THE CONTACT STATED THAT WHILE DRIVING AT VARIOUS SPEEDS, CARBON MONOXIDE WAS PRESENT BECAUSE THE MANIFOLD HAD BEEN FRACTURED. THE VEHICLE WAS REPAIRED TWICE BUT THE FAILURE CONTINUED. THE FAILURE MILEAGE WAS APPROXIMATELY 190,000.
JAN/01 - DISCOVERED CRACKED EXHAUST MANIFOLD. WAS TOLD BY SALVAGE YARD THAT THIS IS A COMMON PROBLEM WITH GEOS AND THEY CAN'T KEEP MANIFOLDS IN STOCK BECAUSE OF THE FREQUENCY. NEW MANIFOLD INSTALLED TO REPLACE CRACKED ONE. THE NEW ONE CRACKED APPROX. 1-2 MONTHS LATER.*AK
UPON DRIVING THE VEHICLE THERE IS A VERY LOUD SOUND COMING FROM THE REAR OF THE VEHICLE DUE TO THE EXHAUST MANIFOLD WHICH HAS A CRACK, CONSUMER HAS REPLACED THE MANIFOLD. PLASE PROVIDE FURTHER DETAILS. *AK
EXHAUST MANIFOLD.
EHAUST FUMES IN THE PASSENGER COMPARTMENT AND NOISE COMING FROM THE ENGINE RESULTED FROM A CRACK IN THE EXHAUST MANIFOLD.
ORIGINAL AND REPLACEMENT EXHAUST MANIFOLD CRACKED. *AW
THE EXHAUST MANIFOLD THAT GOES BACK TO THE EXHAUST SYSTEM HAS CRACKED THIS IS THE SECOND OWNER. TT
EXHAUST MANIFOLD CRACKED IN TWO PLACES. *SKD
EXHUAST MANIFOLD CRACKED, CAUSING CARBON MONOXIDE FUMES TO LEAK INTO PASSENGER'S COMPARTMENT. DEALER HAS BEEN CONTACTED.*AK
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Sep 11, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.