P0420 on a 2017 Honda Pilot
Catalyst Efficiency Below Threshold
P0420 on a 2017 Honda Pilot indicates catalyst efficiency below threshold. It usually stays drivable short-term but should be diagnosed promptly. The most common cause is worn or contaminated catalytic converter (bank 1) (typically $600–$2,400). Confirm the root cause before replacing parts.
What does P0420 mean on a 2017 Honda Pilot?
P0420 is set when the engine control module (ECM) compares the upstream and downstream oxygen sensor readings on Bank 1 and concludes the catalytic converter is no longer storing and releasing oxygen efficiently. In a healthy system, the downstream O2 sensor signal stays relatively flat compared to the switching upstream sensor. When both signals look similar, the ECM infers the catalyst has lost its ability to convert hydrocarbons, carbon monoxide, and oxides of nitrogen into less harmful byproducts.
This guide covers P0420 across the 2015-2019 Honda Pilot generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2015 through 2019.
Is it safe to drive a 2017 Honda Pilot with P0420?
In most cases a 2017 Honda Pilot stays drivable for short trips with P0420 active, but diagnose and repair it promptly. This is a moderate-severity code — ignoring it can lead to further damage or a failed emissions test.
What are the symptoms of P0420 on a 2017 Honda Pilot?
- Check Engine Light is illuminated (steady, not flashing)
- Mild loss of fuel economy
- Faint rotten-egg (sulfur) smell from the exhaust
- Slight reduction in power under hard acceleration
- Vehicle will fail an OBD-II emissions / smog test
- Typically no noticeable drivability issue at idle
What causes P0420 on a 2017 Honda Pilot?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Worn or contaminated catalytic converter (Bank 1) Most common root cause once the vehicle is over 100,000 miles. | Most common | $600–$2,400 |
| Failing downstream (post-catalyst) oxygen sensor Slow-switching O2 sensor mimics a dead catalyst. | Common | $150–$450 |
| Exhaust leak upstream of the downstream O2 sensor | Common | $100–$500 |
| Engine misfire or rich/lean fuel trim contaminating the catalyst Resolve any P0300-series codes before condemning the catalyst. | Occasional | $200–$1,200 |
| Coolant or oil entering the exhaust (head gasket, valve seals) Phosphorus and silicon poison the catalyst substrate. | Rare | $1,200–$3,500 |
| Aftermarket / off-brand catalytic converter that does not meet OEM spec | Occasional | $600–$1,800 |
How to diagnose this on a 2017 Honda Pilot
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Pull all stored and pending codes first
Use an OBD-II scanner to read every stored, pending, and permanent code. If misfire codes (P0300–P0308), fuel trim codes (P0171/P0174), or upstream O2 codes (P0130-series) are present, fix those first — they will set P0420 as a downstream symptom.
Tools: OBD-II scanner with live data capability
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Inspect the exhaust between the engine and the rear O2 sensor
Cold-start the engine and listen for ticking from the manifold, gaskets, flex pipe, and weld seams. A pinhole leak upstream of the downstream O2 sensor pulls in fresh air, fools the sensor, and sets P0420 with a perfectly good catalyst.
Tools: Mechanic's stethoscope or rubber hose, Flashlight
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Compare upstream and downstream O2 sensor voltages in live data
Bring the engine to operating temperature and hold ~2000 RPM. The upstream sensor should switch between roughly 0.1 V and 0.9 V several times per second. The downstream sensor on a healthy catalyst should hold steady around 0.6–0.8 V. If the downstream sensor mirrors the upstream sensor's switching, the catalyst is no longer storing oxygen.
Tools: Scan tool with live PID graphing
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Measure short and long-term fuel trims
Fuel trims outside ±10 % at idle or cruise indicate an unrelated fuel mixture problem that may be cooking the catalyst. Resolve the trim issue before replacing the converter.
Tools: Scan tool with fuel trim PIDs
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Inspect for physical damage and rattle
Tap the body of the catalytic converter with a rubber mallet. A rattling sound indicates the substrate is broken — the converter is finished and must be replaced.
Tools: Rubber mallet
NHTSA complaints & recalls for the 2017 Honda Pilot
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2017 Honda Pilot. Use these to gauge how common a problem is on your specific vehicle before you start chasing Honda Pilot diagnostics.
- ENGINE 447
- POWER TRAIN 117
- VEHICLE SPEED CONTROL 27
- ELECTRICAL SYSTEM 256
- UNKNOWN OR OTHER 128
3 active recalls
- STRUCTURE:BODY:HOOD Nov 2021
Honda (American Honda Motor Co.) is recalling certain 2019 Passport, 2016-2019 Pilot, and 2017-2020 Ridgeline vehicles. The hood latch striker may become damaged and separate from the hood, which can result in the hood opening while driving.…
NHTSA campaign 21V932000 - FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP Dec 2023
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 H…
NHTSA campaign 23V858000 - AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER May 2026
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-…
NHTSA campaign 26V332000
How do I fix P0420 on a 2017 Honda Pilot?
- Replace the catalytic converter assembly (Bank 1) with an OEM or CARB-compliant unit
- Replace the downstream (post-cat) oxygen sensor on Bank 1
- Repair exhaust leak upstream of the downstream O2 sensor
- Address underlying misfires or fuel trim issues before replacing the cat
About the 2015-2019 Honda Pilot
The 2015-2019 Honda Pilot was commonly sold with the following powertrains: 3.5L V6. Common trims include LX, EX, EX-L, Touring, Elite, TrailSport.
What does P0420 actually mean?
P0420 is one of the most common emissions-related diagnostic trouble codes (DTCs) in modern vehicles. It does not mean your engine is about to fail — most cars with this code drive normally for thousands of miles. What it does mean is that the catalytic converter on Bank 1 (the side of the engine containing cylinder #1) is no longer scrubbing exhaust gases the way it should.
The code is set by the engine control module after running a diagnostic monitor that compares the upstream and downstream oxygen sensor signals over a defined drive cycle. When the downstream sensor’s signal starts to oscillate like the upstream sensor — instead of staying smooth — the ECM concludes the converter has lost its oxygen-storage capacity.
Why P0420 matters
While the vehicle remains drivable in almost all cases, ignoring P0420 has real consequences:
- Emissions testing: any state or province with an OBD-II readiness check will fail your vehicle while this code is active.
- Worsening fuel economy: a degraded catalyst combined with feedback-based fuel control will typically cost you 1–3 MPG.
- Cascading damage: if P0420 is caused by an underlying misfire or rich condition, that root cause continues to damage the catalyst, valves, and spark plugs the longer you drive.
When to replace the catalytic converter
Replace the cat only after ruling out every cheaper cause: scanner-confirmed exhaust leaks, slow O2 sensors, misfires, and fuel trim problems. A genuine OEM converter on a daily driver will typically last another 150,000 miles; a cheap universal cat may set P0420 again within 12 months.