According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Honda Insight has 3 documented known issues, with 1 rated critical. The most serious is IMA Hybrid Battery Failure (All Generations) ($400-$4,000 repair). Across all issues with published estimates, repair costs range from $20 to $4,000. DIY maintenance guides at au7o.io.
On the 2000-2022 Honda Insight, all Honda Insight generations (2000-2006, 2010-2014, 2019-2022) experience IMA (Integrated Motor Assist) hybrid battery failures, typically between 75,000-175,000 miles (8-15 years). Symptoms include IMA warning light, reduced fuel economy, lack of electric assist, poor acceleration, and frequent battery recalibrations. The battery cells degrade over time, especially in hot climates. First and second generation batteries are more prone to failure. Third generation (2019-2022) batteries have better warranty coverage (8yr/100k miles in CARB states, 3yr/36k elsewhere). Replacement cost: $1,500-4,000 depending on generation.
Common Symptoms
IMA warning light on dashboard
Reduced fuel economy (MPG drops significantly)
Lack of electric motor assist during acceleration
Poor acceleration and sluggish performance
Battery gauge fluctuating or always empty
Frequent battery recalibrations
Check engine light with P1xxx hybrid codes
How to Fix
Options: (1) OEM Honda replacement battery ($2,500-4,000 installed), (2) Refurbished battery from specialist like Bumblebee Batteries or HybridReVolt ($1,200-2,000), (3) DIY battery rebuild ($400-800 in parts if mechanically skilled). For 3rd gen (2019-2022), check warranty coverage - 8yr/100k in CARB states (CA, NY, etc). InsightCentral.net forum has extensive guides on battery testing, reconditioning, and replacement. Some owners bypass IMA entirely and run as gas-only ($0-300) but lose hybrid benefits.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Best Hybrid Batteries complete remanufactured Honda Insight hybrid battery
Medium ConfidenceLast reported by owners Feb 2026Reviewed Feb 2026
On the 2000-2006 Honda Insight, the 2000-2006 Honda Insight (first generation) experiences premature catalytic converter failures. The lean-burn engine runs very lean, putting extra stress on the catalytic converter. Symptoms include check engine light with P0420/P0430 codes, rattling noise from exhaust, reduced power, and failed emissions test. OEM Honda catalytic converter: $1,200-2,000. Aftermarket: $400-800.
Replace catalytic converter with OEM Honda ($1,200-2,000) or high-quality aftermarket like MagnaFlow or Walker ($400-800). Cheap universal cats won't last on lean-burn engine. Address root cause: clogged EGR system can overheat and kill cat - clean EGR before replacing cat. InsightCentral recommends MagnaFlow Direct-Fit cats - last 100k+ miles.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
2000-2001 Federal/EPA direct-fit branch after diagnosis confirms the converter assembly is below threshold Fitment/availability: 2000-2001 U.S. Confirm transmissi
2002-2006 five-speed-manual upstream pre-converter branch only when diagnosis identifies that assembly rather than the main converter Fitment/availability: 2002-2006 U.S. Honda Insight 1.0L five-speed manual.
Medium ConfidenceLast reported by owners Feb 2026Reviewed Feb 2026
On the 2000-2006 Honda Insight, the 2000-2006 Honda Insight first generation with lean-burn engine experiences clogged EGR (exhaust gas recirculation) systems. The EGR valve and passages get clogged with carbon buildup, causing rough idle, hesitation, poor fuel economy, and check engine lights (P0401 code). The lean-burn operation creates excessive carbon. Cleaning EGR system: $150-400. Replacement: $300-600.
Clean EGR valve and passages with carburetor cleaner or seafoam ($20-50 DIY, $150-400 shop). For severe cases, replace EGR valve ($300-600). DIY cleaning: Remove EGR valve, soak in carb cleaner overnight, clean passages with wire brush. InsightCentral recommends cleaning every 60k-80k miles preventively. Causes catalytic converter failure if ignored.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Genuine Honda 18715-PB2-000 EGR valve gasket
OEMHonda 18715-PB2-000
Confirm VIN and current service procedure before disassembly.
Honda (American Honda Motor Co.) is recalling certain 2020 CR-V Hybrid, Accord Hybrid, and 2020-2021 Insight vehicles. The DC-DC converter may shut down and prevent the 12-volt battery from recharging, possibly resulting in a loss of drive power.
Campaign #20V79800017/12/2020
AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER
Honda (American Honda Motor Co.) is recalling certain 2020-2022 Pilot, Accord, Civic sedan, HR-V, Odyssey, 2020 Civic coupe, Fit, 2021-2022 Civic hatchback, 2021 Civic Type R, Insight, 2020-2021 CR-V, CR-V Hybrid, Passport, Ridgeline, Accord Hybrid, 2020 Acura MDX, 2022 Acura MDX, 2020-2022 Acura RDX, and 2020-2021 Acura TLX vehicles. The front passenger seat weight sensor may crack and short circuit, failing to suppress the air bag as intended.
Campaign #24V06400001/02/2024
AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER
Honda (American Honda Motor Co.) is recalling certain 2018-2021, 2023 Acura TLX, 2019-2024 RDX, 2017-2020, 2022-2026 MDX, 2017-2021, 2023, 2025 Honda Ridgeline, 2017-2022 Pilot, 2019-2021 Passport, 2018-2026 Odyssey, 2019-2022 Insight, 2019-2021 HR-V, 2018-2020 Fit, 2020-2022 CR-V Hybrid, 2017-2022 CR-V, 2017-2018, 2021 Civic Type R, 2017-2021 Civic hatchback, 2016-2020 Civic coupe, 2016-2022 Civic, 2017-2022 Accord Hybrid, and 2016-2022 Accord vehicles. The front passenger seat weight sensor may crack and short circuit, which can cause the air bags to deploy unintentionally during a crash.
Campaign #26V33200021/05/2026
SEAT BELTS:REAR/OTHER:RETRACTOR
Honda (American Honda Motor Co.) is recalling certain 2021 Accord Sedan, Accord Hybrid, CR-V, Ridgeline, 2022 Insight and CR-V Hybrid vehicles. The automatic locking retractor on the second-row center seat belt assembly may deactivate improperly, which can result in an unsecured child restraint system. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
Campaign #21V90000018/11/2021
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Honda (American Honda Motor Co.) is recalling certain 2013-2023 Honda Accord, Civic Coupe, Civic Sedan, Civic Hatchback, Civic Type R, CR-V, HR-V, Ridgeline, Odyssey, Acura ILX, MDX, MDX Hybrid, RDX, RLX, TLX, 2019-2022 Honda Insight, Passport, 2020 Honda CR-V Hybrid, 2018-2019 Honda Clarity PHEV, Fit, and 2015-2020 Honda Accord Hybrid, Pilot, Acura NSX vehicles. The fuel pump inside the fuel tank may fail.
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Honda Insight has 3 documented issues. The most frequently reported are: IMA Hybrid Battery Failure (All Generations), Catalytic Converter Failure (First Gen), EGR System Clogging (Lean Burn Engine). Of these, 1 is rated critical and should be addressed promptly.
Is the Honda Insight reliable?
The 2004 Honda Insight has 3 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: IMA Hybrid Battery Failure (All Generations). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Honda Insight problems?
Repair costs for known Honda Insight issues range from $20 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, IMA Hybrid Battery Failure (All Generations), typically costs $400-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2000-2022 Honda Insight IMA Hybrid Battery Failure (All Generations)?
All Honda Insight generations (2000-2006, 2010-2014, 2019-2022) experience IMA (Integrated Motor Assist) hybrid battery failures, typically between 75,000-175,000 miles (8-15 years). Symptoms include IMA warning light, reduced fuel economy, lack of electric assist, poor accelerat… Repairs typically run $400-$4,000. Severity: high.
What is the 2000-2006 Honda Insight Catalytic Converter Failure (First Gen)?
The 2000-2006 Honda Insight (first generation) experiences premature catalytic converter failures. The lean-burn engine runs very lean, putting extra stress on the catalytic converter. Symptoms include check engine light with P0420/P0430 codes, rattling noise from exhaust, reduce… Repairs typically run $400-$2,000. Severity: medium.
What is the 2000-2006 Honda Insight EGR System Clogging (Lean Burn Engine)?
The 2000-2006 Honda Insight first generation with lean-burn engine experiences clogged EGR (exhaust gas recirculation) systems. The EGR valve and passages get clogged with carbon buildup, causing rough idle, hesitation, poor fuel economy, and check engine lights (P0401 code). The… Repairs typically run $20-$600. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
