diff --git a/core/txpool/blobpool/blobpool.go b/core/txpool/blobpool/blobpool.go
index 64ee3fcd9a6c..adc1ac711d62 100644
--- a/core/txpool/blobpool/blobpool.go
+++ b/core/txpool/blobpool/blobpool.go
@@ -1397,31 +1397,6 @@ func (p *BlobPool) AvailableBlobs(vhashes []common.Hash) int {
 	return available
 }
 
-// convertSidecar converts the legacy sidecar in the submitted transactions
-// if Osaka fork has been activated.
-func (p *BlobPool) convertSidecar(txs []*types.Transaction) ([]*types.Transaction, []error) {
-	head := p.chain.CurrentBlock()
-	if !p.chain.Config().IsOsaka(head.Number, head.Time) {
-		return txs, make([]error, len(txs))
-	}
-	var errs []error
-	for _, tx := range txs {
-		sidecar := tx.BlobTxSidecar()
-		if sidecar == nil {
-			errs = append(errs, errors.New("missing sidecar in blob transaction"))
-			continue
-		}
-		if sidecar.Version == types.BlobSidecarVersion0 {
-			if err := sidecar.ToV1(); err != nil {
-				errs = append(errs, err)
-				continue
-			}
-		}
-		errs = append(errs, nil)
-	}
-	return txs, errs
-}
-
 // Add inserts a set of blob transactions into the pool if they pass validation (both
 // consensus validity and pool restrictions).
 //
@@ -1429,14 +1404,10 @@ func (p *BlobPool) convertSidecar(txs []*types.Transaction) ([]*types.Transactio
 // related to the add is finished. Only use this during tests for determinism.
 func (p *BlobPool) Add(txs []*types.Transaction, sync bool) []error {
 	var (
-		errs []error
+		errs = make([]error, len(txs))
 		adds = make([]*types.Transaction, 0, len(txs))
 	)
-	txs, errs = p.convertSidecar(txs)
 	for i, tx := range txs {
-		if errs[i] != nil {
-			continue
-		}
 		errs[i] = p.add(tx)
 		if errs[i] == nil {
 			adds = append(adds, tx.WithoutBlobTxSidecar())
diff --git a/core/txpool/blobpool/blobpool_test.go b/core/txpool/blobpool/blobpool_test.go
index 51ab27eb0140..29e421c5abf4 100644
--- a/core/txpool/blobpool/blobpool_test.go
+++ b/core/txpool/blobpool/blobpool_test.go
@@ -1689,8 +1689,7 @@ func TestAdd(t *testing.T) {
 	}
 }
 
-// Tests that adding the transactions with legacy sidecar and expect them to
-// be converted to new format correctly.
+// Tests adding transactions with legacy sidecars are correctly rejected.
 func TestAddLegacyBlobTx(t *testing.T) {
 	var (
 		key1, _ = crypto.GenerateKey()
@@ -1724,8 +1723,8 @@ func TestAddLegacyBlobTx(t *testing.T) {
 	)
 	errs := pool.Add([]*types.Transaction{tx1, tx2, tx3}, true)
 	for _, err := range errs {
-		if err != nil {
-			t.Fatalf("failed to add tx: %v", err)
+		if err == nil {
+			t.Fatalf("expected tx add to fail")
 		}
 	}
 	verifyPoolInternals(t, pool)