The substrate has broken up or melted and now restricts exhaust flow.
This generic fault record is not vehicle-specific. Applicability and repair choice must be resolved from vehicle context and test results.
Blocked catalytic converter
At a glance
Fault summary
The substrate has broken up or melted and now restricts exhaust flow.
SeveritySeverity not yet verified Drive?Depends on the exact symptoms EvidenceSource notes available
- Affected system
- Engine / drivability
- Severity
- Severity not yet verified
- Urgency
- Urgency not yet verified
- Can I drive?
- Depends on the exact symptoms Drivability is governed by symptoms and the approved diagnostic safety layer, not by this generic failure-mode label alone.
- Repair/cost band
- Cost band not yet verified
- Vehicle applicability
- No structured vehicle applicability verified yet
- Evidence/confidence
- Source notes available See source & evidence notes below
Short answer
The substrate has broken up or melted and now restricts exhaust flow.
Drive?Depends on the exact symptoms
Can I still drive with this?
Depends on the exact symptoms
Drivability is governed by symptoms and the approved diagnostic safety layer, not by this generic failure-mode label alone.
Common symptoms
- It suddenly lost power
- It accelerates slowly
- A burning smell from the engine
- It cuts out while I am driving
Likely causes
- Overheating damage
Diagnosis checks
Measure the exhaust back pressure
Used-car buyer warning
If inspection evidence supports this fault, unresolved operation may involve: A blocked exhaust raises cylinder pressure and temperature, which stresses the head gasket.
Repair actions / cost band
Repair action and cost band are not yet verified.
Source & evidence notes
- CarFaultIQ diagnostic failure mode fm_catalyst_blocked, manifestation relationships and test effects. Safety review status: pending_human_review. No vehicle-specific prevalence is claimed.