# NHTSA Recall 21V301000 — Completion Reports
> **Improperly Heat-Treated Piston Oil Rings** · Hyundai Motor America · Recalled 2021-08-24
## Latest status
- **Affected units:** 158,493
- **Remedied:** 127,103 (80.19%)
- **Unreachable owners:** 4,460
- **Removed from recall:** 5,784
- **Latest report:** 2023-07-31 (2023-2)
- **Quarters reported:** 8
## Quarterly progress
| Period | Affected | Remedied | Unreachable | Removed | Completion % | Reported |
|--------|----------|----------|-------------|---------|--------------|----------|
| 2021-3 | 158,493 | 34,753 | 4,460 | 852 | 21.93% | 2021-11-01 |
| 2021-4 | 158,493 | 86,968 | 4,460 | 937 | 54.87% | 2022-01-31 |
| 2022-1 | 158,493 | 101,485 | 4,460 | 1,022 | 64.03% | 2022-07-29 |
| 2022-2 | 158,493 | 109,361 | 4,460 | 1,116 | 69% | 2022-07-29 |
| 2022-3 | 158,493 | 114,971 | 4,460 | 1,116 | 72.54% | 2022-10-18 |
| 2022-4 | 158,493 | 120,422 | 4,460 | 1,116 | 75.98% | 2023-01-27 |
| 2023-1 | 158,493 | 123,669 | 4,460 | 5,719 | 78.03% | 2023-04-24 |
| 2023-2 | 158,493 | 127,103 | 4,460 | 5,784 | 80.19% | 2023-07-31 |
## Source
- [NHTSA recall page](https://www.nhtsa.gov/recalls?nhtsaId=21V301000)
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