page 1 SERVICER'S CERTIFICATE AMERICAN HONDA FINANCE CORPORATION MONTHLY SERVICER REPORT -- Honda Auto Receivables 2005-1 Owner Trust 2/1/2006 through 2/28/2006 I. ORIGINAL DEAL PARAMETER INPUTS --------------------------------- (A) Total Portfolio Balance $1,352,890,312.71 (B) Total Securities Balance $1,352,890,312.71 (C) Class A-1 Notes (i) Class A-1 Notes Balance $288,000,000.00 (ii) Class A-1 Notes Percentage (C(i)/B) 21.29% (iii) Class A-1 Notes Rate 2.68600% (iv) Class A-1 Notes Accrual Basis Actual/360 (D) Class A-2 Notes (i) Class A-2 Notes Balance $307,000,000.00 (ii) Class A-2 Notes Percentage (D(i)/B) 22.69% (iii) Class A-2 Notes Rate 3.210% (iv) Class A-2 Notes Accrual Basis 30/360 (E) Class A-3 Notes (i) Class A-3 Notes Balance $415,000,000.00 (ii) Class A-3 Notes Percentage (E(i)/B) 30.68% (iii) Class A-3 Notes Rate 3.530% (iv) Class A-3 Notes Accrual Basis 30/360 (F) Class A-4 Notes (i) Class A-4 Notes Balance $298,900,000.00 (ii) Class A-4 Notes Percentage (F(i)/B) 22.09% (iii) Class A-4 Notes Rate 3.820% (iv) Class A-4 Notes Accrual Basis 30/360 (G) Certificates (i) Certificates Balance $43,990,312.71 (ii) Certificates Percentage (G(i)/B) 3.25% (iii) Certificates Rate 3.820% (iv) Certificates Accrual Basis 30/360 (H) Servicing Fee Rate 1.00% (I) Portfolio Summary (i) Weighted Average Coupon (WAC) 5.02% (ii) Weighted Average Original Maturity (WAOM) 58.33 months (iii) Weighted Average Remaining Maturity (WAM) 52.67 months (iv) Number of Receivables 83,437 (J) Reserve Fund (i) Reserve Account Initial Deposit Percentage 0.50% (ii) Reserve Account Initial Deposit $6,764,451.56 (iii) Specified Reserve Account Percentage 0.75% (iv) Specified Reserve Account Balance $10,146,677.35 (K) Yield Supplement Account Deposit $13,202,261.03 II. INPUTS FROM PREVIOUS MONTHLY SERVICER REPORTS ------------------------------------------------- (A) Total Portfolio Balance $871,558,906.01 (B) Total Securities Balance $871,558,906.01 (C) Cumulative Note and Certificate Pool Factor 0.6442199 (D) Class A-1 Notes (i) Class A-1 Notes Balance $0.00 (ii) Class A-1 Notes Pool Factor 0.0000000 (iii) Class A-1 Notes Interest Carryover Shortfall $0.00 (iv) Class A-1 Notes Principal Carryover Shortfall $0.00 (E) Class A-2 Notes (i) Class A-2 Notes Balance $120,925,190.00 (ii) Class A-2 Notes Pool Factor 0.3938931 (iii) Class A-2 Notes Interest Carryover Shortfall $0.00 (iv) Class A-2 Notes Principal Carryover Shortfall $0.00 (F) Class A-3 Notes (i) Class A-3 Notes Balance $415,000,000.00 (ii) Class A-3 Notes Pool Factor 1.0000000 (iii) Class A-3 Notes Interest Carryover Shortfall $0.00 (iv) Class A-3 Notes Principal Carryover Shortfall $0.00 (G) Class A-4 Notes (i) Class A-4 Notes Balance $298,900,000.00 (ii) Class A-4 Notes Pool Factor 1.0000000 (iii) Class A-4 Notes Interest Carryover Shortfall $0.00 (iv) Class A-4 Notes Principal Carryover Shortfall $0.00 (H) Certificates (i) Certificates Balance $36,733,716.01 (ii) Certificates Pool Factor 0.8350410 (iii) Certificates Interest Carryover Shortfall $0.00 (iv) Certificates Principal Carryover Shortfall $0.00 (I) Servicing Fee (i) Servicing Fee Shortfall $0.00 (J) End of Prior Month Account Balances (i) Reserve Account $10,146,677.35 (ii) Yield Supplement Account $6,556,054.17 (iii) Payahead Account $0.00 (iv) Advances Outstanding $358,429.68 (K) Portfolio Summary as of End of Prior Month (i) Weighted Average Coupon (WAC) 4.93% (ii) Weighted Average Remaining Maturity (WAM) 39.97 months (iii) Number of Receivables 69,438 (L) Note and Certificate Principal Distribution Percentages (i) Note Percentage 95.87% (ii) Certificate Percentage 4.13% page 2 AMERICAN HONDA FINANCE CORPORATION MONTHLY SERVICER REPORT -- Honda Auto Receivables 2005-1 Owner Trust 2/1/2006 through 2/28/2006 III. MONTHLY INPUTS FROM THE MAINFRAME -------------------------------------- (A) Precomputed Contracts Principal (i) Scheduled Principal Collections $0.00 (ii) Prepayments in Full $0.00 (iii) Prepayments in Full due to Repurchases $0.00 (B) Precomputed Contracts Collections $0.00 (C) Precomputed Receivables Interest (B-A((i)+(ii)+(iii))) $0.00 (D) Simple Interest Receivables Principal (i) Principal Collections $21,530,811.80 (ii) Prepayments in Full $9,639,365.62 (iii) Repurchased Receivables Related to Principal $0.00 (E) Simple Interest Receivables Interest (i) Simple Interest Collections $3,450,449.83 (F) Payment Advance for Precomputes (i) Reimbursement of Previous Advances $0.00 (ii) Current Advance Amount $0.00 (G) Interest Advance for simple Interest - Net $70,004.22 (H) Payahead Account (i) Payments Applied $0.00 (ii) Additional Payaheads $0.00 (I) Portfolio Summary as of End of Month (i) Weighted Average Coupon (WAC) 4.93% (ii) Weighted Average Remaining Maturity (WAM) 39.02 months (iii) Remaining Number of Receivables 68,411 (J) Delinquent Receivables # Units Dollar Amount ------------------ -------------------------- (i) 31-60 Days Delinquent 1,844 2.70% $23,993,380.40 2.86% (ii) 61-90 Days Delinquent 364 0.53% $4,862,932.39 0.58% (ii) 91 Days or More Delinquent 57 0.08% $798,823.39 0.10% (K) Vehicles Repossessed During Collection Period 34 0.05% $486,861.09 0.06% (L) Total Repossessed Vehicles in Inventory 67 0.10% $935,358.52 0.11% IV. INPUTS DERIVED FROM OTHER SOURCES ------------------------------------- (A) Collection Account Investment Income $0.00 (B) Reserve Account Investment Income $33,983.19 (C) Yield Supplement Account Investment Income $22,984.64 (D) Trust Fees Expense $2,500.00 (E) Aggregate Net Losses for Collection Period 138,577.67 (F) Liquidated Receivables Information (i) Gross Principal Balance on Liquidated Receivables 703,859.85 (ii) Liquidation Proceeds 330,917.21 (ii) Recoveries from Prior Month Charge Offs 234,364.97 (G) Days in Accrual Period 28 (H) Deal age 14 MONTHLY COLLECTIONS ------------------- V. INTEREST COLLECTIONS ----------------------- (A) Total Interest Collections (III(C)+E(i)-F(i)+F(ii)+G) $3,520,454.05 VI. PRINCIPAL COLLECTIONS ------------------------- (A) Principal Payments Received (III(A((i)+(ii))+(D(i)+(ii))) $31,170,177.42 (B) Liquidation Proceeds (IV(F(i))) 330,917.21 (C) Repurchased Loan Proceeds Related to Principal (III(A(iii)+D(iii))) 0.00 (D) Recoveries from Prior Month Charge Offs (IV(F(ii))) 234,364.97 ------------------ (E) Total Principal Collections (A+B+C+D) $31,735,459.60 VII. TOTAL INTEREST AND PRINCIPAL COLLECTIONS (V(A)+VI(E)) $35,255,913.65 ---------------------------------------------------------- VIII. YIELD SUPPLEMENT DEPOSIT $412,298.33 ------------------------------ IX. TOTAL AVAILABLE AMOUNT (VII+VIII) $35,668,211.98 ------------------------------------- MONTHLY DISTRIBUTIONS --------------------- X. FEE DISTRIBUTIONS -------------------- (A) Servicing Fee (i) Servicing Fee Due (I(H)/12)(II(B))+(II(H)(i)) $726,299.09 (ii) Servicing Fee Paid 726,299.09 ------------------ (iii) Servicing Fee Shortfall $0.00 (B) Reserve Account Investment Income (IV(B)) $33,983.19 (C) Yield Supplement Account Investment Income (IV(C)) $0.00 (D) Trust Fees Expense (IV(D)) $2,500.00 XI. DISTRIBUTIONS TO NOTEHOLDERS -------------------------------- (A) Interest (i) Class A-1 Notes (a) Class A-1 Notes Interest Due $0.00 (b) Class A-1 Notes Interest Paid 0.00 ------------------ (c) Class A-1 Notes Interest Shortfall $0.00 (ii) Class A-2 Notes (a) Class A-2 Notes Interest Due $323,474.88 (b) Class A-2 Notes Interest Paid 323,474.88 ------------------ (c) Class A-2 Notes Interest Shortfall $0.00 (iii) Class A-3 Notes (a) Class A-3 Notes Interest Due $1,220,791.67 (b) Class A-3 Notes Interest Paid 1,220,791.67 ------------------ (c) Class A-3 Notes Interest Shortfall $0.00 page 3 AMERICAN HONDA FINANCE CORPORATION MONTHLY SERVICER REPORT -- Honda Auto Receivables 2005-1 Owner Trust 2/1/2006 through 2/28/2006 (iv) Class A-4 Notes (a) Class A-4 Notes Interest Due $951,498.33 (b) Class A-4 Notes Interest Paid 951,498.33 ------------------ (c) Class A-4 Notes Interest Shortfall $0.00 (v) Total Note Interest (a) Total Note Interest Due $2,495,764.88 (b) Total Note Interest Paid 2,495,764.88 ------------------ (c) Total Note Interest Shortfall $0.00 (d) Reserve Account Withdrawal for Note Interest $0.00 Amount available for distributions after Fees & Interest (IX-(X(A)(ii)-(D))-XI(A)(v)(b)) $32,443,648.01 (B) Principal (i) Noteholders' Principal Distribution Amounts $30,557,639.53 (ii) Class A-1 Notes Principal (a) Class A-1 Notes Principal Due $0.00 (b) Class A-1 Notes Principal Paid 0.00 ------------------ (c) Class A-1 Notes Principal Shortfall $0.00 (d) Reserve Account Withdrawal $0.00 (iii) Class A-2 Notes Principal (a) Class A-2 Notes Principal Due $30,557,639.53 (b) Class A-2 Notes Principal Paid 30,557,639.53 ------------------ (c) Class A-2 Notes Principal Shortfall $0.00 (d) Reserve Account Withdrawal $0.00 (iv) Class A-3 Notes Principal (a) Class A-3 Notes Principal Due $0.00 (b) Class A-3 Notes Principal Paid 0.00 ------------------ (c) Class A-3 Notes Principal Shortfall $0.00 (d) Reserve Account Withdrawal $0.00 (v) Class A-4 Notes Principal (a) Class A-4 Notes Principal Due $0.00 (b) Class A-4 Notes Principal Paid 0.00 ------------------ (c) Class A-4 Notes Principal Shortfall $0.00 (d) Reserve Account Withdrawal $0.00 (vi) Total Notes Principal (a) Total Notes Principal Due 30,557,639.53 (b) Total Notes Principal Paid 30,557,639.53 ------------------ (c) Total Notes Principal Shortfall $0.00 (d) Reserve Account Withdrawal $0.00 XII. RESERVE FUND DEPOSIT ------------------------- Amount available for deposit into reserve account $1,886,008.48 Amount deposited into reserve account 0.00 Excess Amount Released from Reserve Account 0.00 ------------------ Excess funds available to Certificateholders 1,886,008.48 ------------------ XIII. DISTRIBUTIONS TO CERTIFICATEHOLDERS ----------------------------------------- (A) Interest (i) Certificate Monthly Interest Due $116,935.66 (ii) Certificate Interest Shortfall Beginning Balance $0.00 ------------------ (iii) Total Certificate Interest Due $116,935.66 (iv) Certificate Interest Paid 116,935.66 ------------------ (v) Certificate Interest Shortfall Ending Balance $0.00 (B) Principal (i) Certificate Monthly Principal Due $1,316,397.74 (ii) Certificate Principal Shortfall Beginning Balance $0.00 ------------------ (iii) Total Certificate Principal Due $1,316,397.74 (iv) Certificate Principal Paid 1,316,397.74 ------------------ (v) Certificate Principal Shortfall Ending Balance $0.00 (C) Release to Seller $452,675.08 DISTRIBUTIONS SUMMARY --------------------- (A) Total Collections $35,668,211.98 (B) Service Fee $726,299.09 (C) Trustee Fees 2,500.00 (D) Class A1 Amount $0.00 (E) Class A2 Amount $30,881,114.41 (F) Class A3 Amount $1,220,791.67 (G) Class A4 Amount $951,498.33 (H) Amount Deposited into Reserve Account $0.00 (I) Certificateholders $1,433,333.40 (J) Release to seller $452,675.08 (K) Total amount distributed $35,668,211.98 (L) Amount of Draw from Reserve Account 0.00 (M) Excess Amount Released from Reserve Account 0.00 PORTFOLIO AND SECURITY SUMMARY ------------------------------ Beginning End XIV. POOL BALANCES AND PORTFOLIO INFORMATION of Period of Period -------------------------------------------- ----------------- ----------------- (A) Balances and Principal Factors (i) Aggregate Balance of Notes $834,825,190.00 $804,267,550.47 (ii) Note Pool Factor 0.6378067 0.6144607 (iii) Class A-1 Notes Balance 0.00 0.00 (iv) Class A-1 Notes Pool Factor 0.0000000 0.0000000 (v) Class A-2 Notes Balance 120,925,190.00 90,367,550.47 (vi) Class A-2 Notes Pool Factor 0.3938931 0.2943568 (vii) Class A-3 Notes Balance 415,000,000.00 415,000,000.00 (viii) Class A-3 Notes Pool Factor 1.0000000 1.0000000 (ix) Class A-4 Notes Balance 298,900,000.00 298,900,000.00 (x) Class A-4 Notes Pool Factor 1.0000000 1.0000000 page 4 AMERICAN HONDA FINANCE CORPORATION MONTHLY SERVICER REPORT -- Honda Auto Receivables 2005-1 Owner Trust 2/1/2006 through 2/28/2006 (xi) Certificates Balance 36,733,716.01 35,417,318.27 (xii) Certificates Pool Factor 0.8350410 0.8051163 (xiii) Total Principal Balance of Notes and Certificates 871,558,906.01 839,684,868.74 (B) Portfolio Information (i) Weighted Average Coupon (WAC) 4.93% 4.93% (ii) Weighted Average Remaining Maturity (WAM) 39.97 months 39.02 months (iii) Remaining Number of Receivables 69,438 68,411 (iv) Portfolio Receivable Balance $871,558,906.01 $839,684,868.74 (C) Outstanding Advance Amount $358,429.68 $428,433.90 (D) Outstanding Payahead Balance $0.00 $0.00 SUMMARY OF ACCOUNTS ------------------- XV. RECONCILIATION OF RESERVE ACCOUNT ------------------------------------- (A) Beginning Reserve Account Balance $10,146,677.35 (B) Draws 0.00 (i) Draw for Servicing Fee 0.00 (ii) Draw for Interest 0.00 (iii) Draw for Realized Losses 0.00 (C) Excess Interest Deposited into the Reserve Account 0.00 (D) Reserve Account Balance Prior to Release 10,146,677.35 (E) Reserve Account Required Amount 10,146,677.35 (F) Final Reserve Account Required Amount 10,146,677.35 (G) Excess Reserve Account Amount 0.00 (H) Release of Reserve Account Balance to Seller 0.00 (I) Ending Reserve Account Balance 10,146,677.35 XVI. RECONCILIATION OF YIELD SUPPLEMENT ACCOUNT ----------------------------------------------- (A) Beginning Yield Supplement Account Balance 6,556,054.17 (B) Investment Earnings 22,984.64 (C) Investment Earnings Withdraw 0.00 (D) Additional Yield Supplement Amounts 0.00 (E) Yield Supplement Deposit Amount 412,298.33 (F) Release of Yield Deposit Account Balance to Seller 0.00 ------------------ (G) Ending Yield Supplement Account Balance 6,166,740.48 XVII. NET LOSS AND DELINQUENCY ACCOUNT ACTIVITY ----------------------------------------------- (A) Liquidated Contracts (i) Liquidation Proceeds $330,917.21 (ii) Recoveries on Previously Liquidated Contracts 234,364.97 (B) Aggregate Net Losses for Collection Period 138,577.67 (C) Net Loss Rate for Collection Period (annualized) 0.19% (D) Cumulative Net Losses for all Periods 5,021,891.53 (E) Delinquent Receivables # Units Dollar Amount ------------------ -------------------------- (i) 30-59 Days Delinquent 1,844 2.70% $23,993,380.40 2.86% (ii) 60-89 Days Delinquent 364 0.53% $4,862,932.39 0.58% (iii) 90 Days or More Delinquent 57 0.08% $798,823.39 0.10% XVIII. REPOSSESSION ACTIVITY # Units Dollar Amount ---------------------------- ------------------ -------------------------- (A) Vehicles Repossessed During Collection Period 34 0.05% $486,861.09 0.06% (B) Total Repossessed Vehicles in Inventory 67 0.10% $935,358.52 0.11% XIX. TESTS FOR INCREASE IN SPECIFIED RESERVE ACCOUNT BALANCE ------------------------------------------------------------ (A) Ratio of Net Losses to the Pool Balance as of Each Collection Period (i) Second Preceding Collection Period 0.84% (ii) Preceding Collection Period 0.60% (iii) Current Collection Period 0.19% (iv) Three Month Average (Avg(i,ii,iii)) 0.55% (B) Ratio of Balance of Contracts Delinquent 61 Days or More to the Outstanding Balance of Receivables. (i) Second Preceding Collection Period 0.77% (ii) Preceding Collection Period 0.90% (iii) Current Collection Period 0.71% (iv) Three Month Average (Avg(i,ii,iii)) 0.79% (C) Loss and Delinquency Trigger Indicator Trigger was not hit. I hereby certify that the servicing report provided is true and accurate to the best of my knowledge. /s/ John Weisickle ----------------------- Mr. John Weisickle Vice President