How to Replace the Rear Muffler on a 2004 Honda CR-V

You can replace a 2004 Honda CR-V rear muffler yourself with basic hand tools in about an hour, or pay a shop $200 to $400 for the part and labor combined

The rear muffler on a 2004 CR-V bolts to the exhaust pipe and hangs from rubber isolators underneath the vehicle. Replacement is straightforward: you remove the bolts holding it to the pipe, unhook the rubber hangers, slide the old muffler out, and bolt the new one in. A new OEM Honda muffler costs $150 to $250 depending on the supplier; aftermarket versions run $80 to $150. If you do the work yourself, you need a socket set, wrenches, jack, jack stands, and about 90 minutes of time. If you take it to a shop, expect to pay labor on top of the part cost.

Key Takeaways

The 2004 CR-V rear muffler is held by two bolts to the exhaust pipe and two rubber hangers that you can remove without special tools.
OEM Honda mufflers cost $150 to $250; aftermarket replacements are cheaper but may not fit as precisely or last as long.
You will need a jack and jack stands to safely get under the vehicle, not just a floor jack alone.
The job takes about an hour if you work carefully, and the bolts often seize, so spray them with penetrating oil 15 minutes before you start.
A shop will charge $200 to $400 total, including the part and one to two hours of labor.

What you need to buy and gather

A new muffler is the only part you must buy. For a 2004 CR-V, an OEM Honda muffler (part number 18310-PZA-A01) is the safest choice because it matches the original fit and hangers exactly. You can order it from Honda dealers, RockAuto, or eBay for $150 to $250 depending on the seller. Aftermarket mufflers from brands like Bosal or Walker cost $80 to $150 but vary in quality and may require you to reuse your old hangers or buy new ones separately.

For tools, gather a socket set (metric, 8mm to 14mm), an adjustable wrench, a jack, two jack stands rated for at least 4,000 pounds, wheel chocks, a penetrating oil spray (like PB Blaster or Liquid Wrench), and a creeper or cardboard to lie on. You may also want a flashlight or headlamp because the muffler area is dark. Do not rely on a floor jack alone to hold the vehicle—always use jack stands.

Steps to remove the old muffler

Park on a level surface, set the parking brake, and place wheel chocks behind the rear wheels. Loosen the lug nuts on both rear wheels while the vehicle is still on the ground, then raise the rear end with the jack under the frame rail (not the bumper or body panel). Once the vehicle is high enough to work under safely, place jack stands under both frame rails and lower the vehicle onto them. Remove the lug nuts and wheels.

Spray penetrating oil on the two bolts that connect the muffler to the exhaust pipe—these are located just forward of the muffler, underneath. Wait 15 to 20 minutes for the oil to soak in. Use a socket wrench to remove both bolts; they are typically 12mm or 14mm. If a bolt spins without loosening, hold the nut on the back side with an adjustable wrench while you turn the bolt head. Once the bolts are out, locate the two rubber hangers on either side of the muffler where it connects to the frame. Gently pry the muffler away from the exhaust pipe and unhook both rubber hangers by twisting the muffler slightly and sliding it backward. The old muffler should now come free.

Steps to install the new muffler

Before you install the new muffler, check that the rubber hangers are in good condition. If the old ones are cracked, hardened, or missing pieces, replace them with new ones (Honda part numbers 18305-PZA-A00 and 18306-PZA-A00, about $15 to $25 each). Slide the new muffler into position from underneath, aligning the inlet pipe with the exhaust outlet. Hook both rubber hangers onto the frame first, then align the bolt holes.

Insert the two bolts through the muffler flange and into the exhaust pipe. Hand-tighten both bolts first to make sure everything is aligned, then use a socket wrench to tighten them to 16 foot-pounds of torque. If you do not have a torque wrench, tighten them snugly but do not over-tighten—you want them firm enough that the muffler does not rattle, but not so tight that you strip the threads. Reinstall the wheels, hand-tighten the lug nuts, then raise the vehicle with the jack and remove the jack stands. Lower the vehicle to the ground and tighten the lug nuts in a star pattern to 80 foot-pounds.

When to take it to a shop instead

If the bolts are severely seized and will not budge after soaking with penetrating oil, a shop has heat and impact tools that can remove them without stripping the threads. If the exhaust pipe itself is rusted or damaged, you may need to replace more than just the muffler, and a shop can diagnose that while you wait. If you do not have a jack and jack stands, or if you are not comfortable working under a raised vehicle, a shop is the safer choice.

A typical shop job costs $200 to $400. The part itself runs $150 to $250 (usually OEM), and labor is $50 to $150 depending on how stuck the bolts are and whether the shop needs to replace the rubber hangers. Call ahead and ask whether the shop uses OEM or aftermarket mufflers, because that affects both the price and how long the part will last.

Aftermarket versus OEM: what the difference means

An OEM Honda muffler is built to Honda's specifications and uses the exact same hangers, bolt pattern, and materials as the original. It will fit without modification and typically lasts 8 to 12 years. An aftermarket muffler from a brand like Bosal or Walker is cheaper but may have slightly different dimensions, require you to reuse your old hangers, or use different bolt sizes. Some aftermarket mufflers are well-made and last just as long; others are thinner steel and rust faster.

If you plan to keep the CR-V for several more years and want to avoid a second replacement, the OEM muffler is worth the extra $70 to $100. If you are selling the vehicle soon or want the lowest upfront cost, an aftermarket muffler is acceptable. Either way, make sure the muffler you buy is listed as compatible with a 2004 Honda CR-V, because CR-V mufflers changed between model years.

What to listen for after installation

Start the engine and listen for any rattling or loose sounds coming from underneath. If you hear a rattle, the muffler may not be seated properly on the exhaust pipe, or the rubber hangers may not be hooked correctly. Turn off the engine, get back under the vehicle, and check that both bolts are tight and both hangers are fully engaged. A small amount of exhaust noise is normal, but a loud rattle or dragging sound means something is loose.

Take a short test drive at highway speed and listen again. If the rattle persists, return to the shop or go back under the vehicle to diagnose. Sometimes a rattle is caused by a heat shield that has come loose, not the muffler itself. If you installed the muffler yourself and are unsure whether the noise is normal, a shop can inspect it for $30 to $50.

Frequently Asked Questions

Can I drive the CR-V without a muffler while I wait for the new one?

Technically yes, but it is loud and may fail emissions testing depending on your state. Driving without a muffler for more than a few miles can also damage the catalytic converter if exhaust heat builds up. If your muffler has fallen off, have it towed or drive straight to a shop rather than running it without one.

How do I know if my muffler needs replacing?

A muffler needs replacement if you see rust holes, hear a loud rattle from underneath, see it dragging on the ground, or notice a significant increase in exhaust noise. A visual inspection from underneath will show rust or damage. If you are unsure, a shop can look at it for free or for a small diagnostic fee.

Will a different brand muffler fit a 2004 CR-V?

Most aftermarket mufflers sold for a 2004 CR-V will fit, but always check the product listing to confirm compatibility. Some brands use different hanger designs or bolt patterns, so verify before you buy. If you order online and it does not fit, you may have to pay return shipping.

Do I need to replace the rubber hangers at the same time?

Only if they are cracked, hardened, or missing. If the old hangers look intact and flexible, you can reuse them. New hangers cost $15 to $25 per pair and take five minutes to swap, so if you are already under the vehicle, it is worth inspecting them and replacing them if they look worn.

What is the difference between a resonator and a muffler?

A resonator is a smaller chamber that sits between the catalytic converter and the muffler; a muffler is the larger chamber at the rear that reduces noise. A 2004 CR-V has both. This article covers the rear muffler only. If your resonator is damaged, that is a separate repair.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.