The 2016 Honda Pilot has a known emissions control issue affecting thousands of vehicles

The 2016 Honda Pilot has experienced widespread problems with its emissions control system, particularly involving the secondary air injection (SAI) system and catalytic converter failures. Owners report check engine lights, rough idling, and reduced fuel economy. Honda issued multiple technical service bulletins addressing these issues, and some owners have pursued warranty claims or repairs through dealers.

The problem is not limited to one component. Some vehicles develop clogged or failing catalytic converters, while others have faulty SAI pumps or valves that trigger diagnostic trouble codes. The issues typically emerge between 60,000 and 100,000 miles, though some appear earlier. Understanding what these systems do and what symptoms to watch for can help you decide whether to pursue a repair or warranty claim.

Key Takeaways

  • The 2016 Pilot's secondary air injection system and catalytic converter are the primary sources of emissions-related failures, usually appearing after 60,000 miles.
  • Common warning signs include a check engine light, rough idle, hesitation during acceleration, and a sulfur smell from the exhaust.
  • Honda released technical service bulletins for these issues, and some owners have had repairs covered under extended warranty programs or goodwill repairs.
  • If your vehicle is out of warranty, you can request a diagnostic scan at a Honda dealer to confirm which emissions component is failing.
  • Some owners have pursued lemon law claims or small claims court cases when repairs were denied or repeated failures occurred.

How the secondary air injection system works and why it fails

The secondary air injection (SAI) system pumps fresh air into the exhaust manifold to help burn unburned fuel and reduce emissions. In the 2016 Pilot, this system uses an electric pump and a network of valves and hoses. When the pump fails or the valves stick, the system cannot inject air properly, and the engine computer triggers a check engine light with a P0410 or P0411 diagnostic trouble code.

The SAI pump in the 2016 Pilot is prone to electrical failure and mechanical wear. The pump motor can burn out, or the internal check valve can fail, allowing exhaust gases to flow backward and damage the pump. When this happens, the system either stops working entirely or works intermittently, causing the check engine light to appear and disappear. Honda's technical service bulletin TSB 16-012 addresses this issue and describes the replacement procedure.

Replacement of the SAI pump typically costs between $400 and $800 at a Honda dealer, depending on labor rates in your area. Some owners have reported that Honda covered the repair under goodwill warranty even after the factory warranty expired, particularly if the vehicle had low mileage when the problem appeared.

Catalytic converter problems and what triggers them

The catalytic converter is a emissions device that uses heat and chemical reaction to convert harmful gases into less harmful ones. In the 2016 Pilot, catalytic converters have been known to clog or fail prematurely, often as a result of unburned fuel entering the exhaust system. This unburned fuel can result from a faulty SAI system, a malfunctioning oxygen sensor, or an engine running too rich (burning more fuel than air).

When a catalytic converter fails, you may notice a rotten egg or sulfur smell from the exhaust, a rattling noise from under the vehicle, or a significant drop in fuel economy and engine power. The check engine light will appear with a P0420 or P0430 code, indicating the converter is not working efficiently. Some owners report that the converter fails suddenly, while others notice a gradual decline in performance.

A new catalytic converter for the 2016 Pilot costs between $800 and $1,500 at a Honda dealer, plus labor. Because the converter is an emissions component, it is covered under the federal emissions warranty for eight years or 80,000 miles, even if the general powertrain warranty has expired. If your vehicle is within this window, you may be able to have the converter replaced at no cost.

Check engine light codes and what they mean

When the emissions system fails, your vehicle's onboard diagnostic system stores a trouble code and illuminates the check engine light. The most common codes associated with 2016 Pilot emissions problems are P0410 (secondary air injection system malfunction), P0411 (secondary air injection system incorrect flow), P0420 (catalyst system efficiency below threshold), and P0430 (catalyst system efficiency below threshold, bank 2).

You can retrieve these codes yourself using an inexpensive OBD-II scanner, available at auto parts stores for $25 to $100. The scanner plugs into the diagnostic port under the steering wheel and displays the code number and a brief description. However, the code alone does not tell you which component is failing — a P0410 code means the SAI system is not working, but it could be the pump, a valve, a hose, or an electrical connection.

A Honda dealer can perform a more detailed diagnostic using factory scan tools and technical knowledge specific to the 2016 Pilot. This diagnostic typically costs $100 to $150 and will pinpoint the exact component that needs repair. Many dealers will waive this fee if you authorize the repair at their shop.

What Honda's technical service bulletins say

Honda released several technical service bulletins (TSBs) addressing emissions issues in the 2016 Pilot. TSB 16-012 covers secondary air injection system failures and provides step-by-step repair procedures for dealers. TSB 17-008 addresses catalytic converter efficiency issues. These bulletins do not mandate repairs or warranty coverage — they are internal documents that guide dealers on how to diagnose and fix known problems.

The existence of a TSB is significant because it shows Honda acknowledged the problem. When you contact a Honda dealer about an emissions issue, you can reference the relevant TSB number to show that the problem is documented. Some dealers use TSBs as justification for covering repairs under goodwill warranty even after the factory warranty expires, particularly if the vehicle has low mileage or the failure is widespread.

You can search for TSBs on Honda's owner portal or ask your dealer to look up bulletins for your vehicle's year, make, model, and VIN. Not all dealers will volunteer this information, so asking directly increases the chance they will consider a goodwill repair.

Warranty coverage and how to request a repair

The 2016 Honda Pilot comes with a three-year or 36,000-mile basic warranty and an eight-year or 80,000-mile federal emissions warranty. The emissions warranty covers the catalytic converter, oxygen sensors, and emissions control components like the SAI system. If your vehicle is within the emissions warranty window, you can have these components repaired or replaced at no cost at any Honda dealer.

If your vehicle is outside both warranties, you can still request a repair at a Honda dealer and ask them to consider a goodwill warranty claim. Goodwill repairs are at Honda's discretion and depend on factors like mileage, age, maintenance history, and whether the problem is widespread. Bring documentation of regular maintenance and mention the TSB number if applicable. Some owners report success with goodwill claims up to 100,000 miles or seven years, though this is not may provide.

To request a repair, contact your local Honda dealer and describe the symptoms (check engine light, rough idle, smell, etc.). Ask them to perform a diagnostic scan to identify the failing component. If the vehicle is under warranty, the repair should be covered. If it is out of warranty, ask the service manager to review the TSB and consider a goodwill repair. Get a written estimate before authorizing any work.

Lemon law claims and other options if warranty repair is denied

If Honda or a dealer refuses to repair a known emissions problem, you may have legal options depending on your state. Most states have lemon laws that require manufacturers to repair or replace vehicles with defects that substantially impair safety, use, or value. An emissions system failure that prevents the vehicle from passing inspection or causes performance problems may may have access to.

Lemon law claims typically require that you give the manufacturer a reasonable number of repair attempts (usually three to four) before filing. Document every visit to the dealer, including dates, mileage, symptoms, and what was repaired or not repaired. Keep copies of all work orders and correspondence with Honda.

If you believe you have a valid lemon law claim, consult an attorney who specializes in consumer protection or lemon law cases. Many offer free initial consultations. Some states allow you to file a claim in small claims court without an attorney, though the process and dollar limits vary by state. You can also file a complaint with your state's attorney general or consumer protection office, which may pressure Honda to resolve the issue.

Frequently Asked Questions

Can I drive the 2016 Pilot with a check engine light from the emissions system?

Yes, the vehicle is safe to drive, but you should have the problem diagnosed soon. The check engine light means the emissions system is not working properly, which may affect fuel economy and performance. More importantly, you may not pass a state emissions inspection, and the problem may worsen over time.

Will the emissions problem get worse if I ignore it?

Usually, yes. A failing SAI pump or catalytic converter does not repair itself. Ignoring it may cause secondary damage — for example, a clogged catalytic converter can cause backpressure that damages the engine. Addressing the problem early is typically cheaper than waiting.

Is the 2016 Pilot the only model year affected by these emissions issues?

No. The 2015 and 2017 model years have reported similar problems, though the 2016 appears to have the highest frequency of complaints. If you own a different Pilot model year and experience emissions symptoms, the same diagnostic and repair procedures explore.

Can I replace the SAI system or catalytic converter with an aftermarket part instead of a Honda part?

Yes, but aftermarket parts may not carry the same warranty as Honda parts, and some shops may not install them. For emissions components, using OEM (original equipment manufacturer) parts is often recommended to may support proper fit and function. Aftermarket catalytic converters are typically cheaper but may have a shorter lifespan.

What should I do if my 2016 Pilot fails an emissions inspection because of these problems?

Contact a Honda dealer when ready and request a diagnostic scan. If the vehicle is within the eight-year or 80,000-mile emissions warranty, the repair should be covered at no cost. If it is out of warranty, ask for a goodwill repair. In the meantime, some states allow you to request a waiver or extension on the inspection important date if you have proof of a repair attempt in progress.