diff --git a/crates/engine/src/client.rs b/crates/engine/src/client.rs
index 197f575..f908628 100644
--- a/crates/engine/src/client.rs
+++ b/crates/engine/src/client.rs
@@ -27,7 +27,7 @@ use url::Url;
 
 use hilo_providers_alloy::AlloyL2ChainProvider;
 
-use crate::{Engine, EngineApiError};
+use crate::{Engine, EngineError};
 
 /// A Hyper HTTP client with a JWT authentication layer.
 type HyperAuthClient<B = Full<Bytes>> = HyperClient<B, AuthService<Client<HttpConnector, B>>>;
@@ -62,13 +62,13 @@ impl EngineClient {
 
 #[async_trait]
 impl Engine for EngineClient {
-    type Error = EngineApiError;
+    type Error = EngineError;
 
     async fn get_payload(
         &self,
         payload_id: PayloadId,
     ) -> Result<OpExecutionPayloadEnvelopeV3, Self::Error> {
-        self.engine.get_payload_v3(payload_id).await.map_err(|_| EngineApiError::PayloadError)
+        self.engine.get_payload_v3(payload_id).await.map_err(|_| EngineError::PayloadError)
     }
 
     async fn forkchoice_update(
@@ -76,10 +76,7 @@ impl Engine for EngineClient {
         state: ForkchoiceState,
         attr: Option<OpPayloadAttributes>,
     ) -> Result<ForkchoiceUpdated, Self::Error> {
-        self.engine
-            .fork_choice_updated_v2(state, attr)
-            .await
-            .map_err(|_| EngineApiError::PayloadError)
+        self.engine.fork_choice_updated_v2(state, attr).await.map_err(|_| EngineError::PayloadError)
     }
 
     async fn new_payload(
@@ -90,7 +87,7 @@ impl Engine for EngineClient {
         self.engine
             .new_payload_v3(payload, parent_beacon_block_root)
             .await
-            .map_err(|_| EngineApiError::PayloadError)
+            .map_err(|_| EngineError::PayloadError)
     }
 
     async fn l2_block_ref_by_label(
@@ -100,11 +97,11 @@ impl Engine for EngineClient {
         let number = match numtag {
             BlockNumberOrTag::Number(n) => n,
             BlockNumberOrTag::Latest => {
-                self.rpc.latest_block_number().await.map_err(|_| EngineApiError::PayloadError)?
+                self.rpc.latest_block_number().await.map_err(|_| EngineError::LatestBlockNumber)?
             }
-            _ => return Err(EngineApiError::PayloadError),
+            _ => return Err(EngineError::InvalidBlockTag),
         };
-        self.rpc.l2_block_info_by_number(number).await.map_err(|_| EngineApiError::PayloadError)
+        self.rpc.l2_block_info_by_number(number).await.map_err(|_| EngineError::L2BlockInfoFetch)
     }
 }
 
diff --git a/crates/engine/src/controller.rs b/crates/engine/src/controller.rs
index 0dd8607..0d24ae0 100644
--- a/crates/engine/src/controller.rs
+++ b/crates/engine/src/controller.rs
@@ -14,7 +14,7 @@ use std::{sync::Arc, time::Duration};
 use tokio::time::sleep;
 use url::Url;
 
-use crate::{Engine, EngineApiError, EngineClient};
+use crate::{Engine, EngineClient, EngineError};
 
 /// L1 epoch block
 #[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
@@ -94,7 +94,7 @@ impl EngineController {
 
 #[async_trait]
 impl Executor for EngineController {
-    type Error = EngineApiError;
+    type Error = EngineError;
 
     /// Waits for the engine to be ready.
     async fn wait_until_ready(&mut self) {
diff --git a/crates/engine/src/errors.rs b/crates/engine/src/errors.rs
index 603e129..9264bf8 100644
--- a/crates/engine/src/errors.rs
+++ b/crates/engine/src/errors.rs
@@ -2,11 +2,20 @@
 
 /// An error that originated from the engine api.
 #[derive(Debug, thiserror::Error)]
-pub enum EngineApiError {
+pub enum EngineError {
     /// An error occurred while executing the payload.
     #[error("An error occurred while executing the payload")]
     PayloadError,
     /// An error occurred while computing the output root.
     #[error("An error occurred while computing the output root")]
     OutputRootError,
+    /// Invalid block tag used to fetch the L2 block ref.
+    #[error("Invalid block tag. Use `latest` or a block number.")]
+    InvalidBlockTag,
+    /// Failed to fetch the latest block number from the l2 rpc provider.
+    #[error("Failed to fetch the latest block number from the l2 rpc provider")]
+    LatestBlockNumber,
+    /// Failed to get the `L2BlockInfo` for the given block number.
+    #[error("Failed to get the `L2BlockInfo` for the given block number")]
+    L2BlockInfoFetch,
 }
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index f6e7231..88e5207 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -10,7 +10,7 @@ mod traits;
 pub use traits::Engine;
 
 mod errors;
-pub use errors::EngineApiError;
+pub use errors::EngineError;
 
 mod controller;
 pub use controller::EngineController;