2012-2016 Honda CR-Z Cylinder Head: Diagnosis, Costs, and Used Buying Checks
Learn the signs of a failing cylinder head on your CR-Z, from overheating to misfires, and how to choose a reliable used replacement.
- The 2012-2016 Honda CR-Z's 1.5L hybrid engine does not have a common, widespread defect causing cylinder head failure; issues are usually tied to age or overheating.
- Replacement is a major, expert-level repair (5/5 difficulty) and is not recommended for DIYers.
- Before installing a used cylinder head, it is essential to have it professionally inspected and resurfaced by a machine shop to ensure it is not warped or cracked.
- New aftermarket cylinder heads are not readily available, making a verified used OEM part the most common and practical replacement option.
Symptoms of a Failing Cylinder Head
A problem with the cylinder head or the head gasket that seals it to the engine block can cause serious issues. Often, the symptoms of a cracked head are identical to those of a blown head gasket. Look for these specific warning signs:
- Engine Overheating: This is one of the most common signs. A crack can allow hot combustion gases to enter the cooling system, displacing coolant and causing the engine to overheat.
- White Smoke from Exhaust: If a crack forms between a coolant passage and the combustion chamber, coolant will leak into the cylinder and be burned off as steam. This produces clouds of sweet-smelling white smoke from the tailpipe.
- Milky or Frothy Engine Oil: A crack between an oil passage and a coolant passage will allow the two fluids to mix. When you check the oil dipstick or look under the oil filler cap, you may see a milky, coffee-colored sludge.
- Unexplained Coolant Loss: If you constantly have to add coolant but can't find any visible leaks from hoses or the radiator, the coolant may be leaking internally into the engine's cylinders or oil.
- Engine Misfires and Rough Idle: Coolant leaking into a cylinder can foul the spark plug, preventing proper combustion and causing a misfire. This will often trigger the Check Engine Light with codes like P0300, P0301, P0302, P0303, or P0304.
- Poor Performance and Fuel Economy: A loss of compression from a compromised seal will result in reduced engine power, sluggish acceleration, and worse gas mileage.
Known Issues, Recalls, and TSBs for the 2012-2016 Honda CR-Z
The 1.5L LEA hybrid engine in the 2012-2016 Honda CR-Z is known for its reliability. Unlike some other engines (including Honda's 1.5L turbo engine, which is a different design), the CR-Z does not have a widely documented pattern of premature cylinder head or head gasket failure. Failures on this engine are typically due to external factors rather than a specific design flaw.
- Recalls: There have been no recalls issued by the National Highway Traffic Safety Administration (NHTSA) for the cylinder head or any internal engine components on the 2012-2016 CR-Z. Recalls for this vehicle primarily concern the airbag inflators.
- Technical Service Bulletins (TSBs): No TSBs have been issued that point to a common defect with the cylinder head itself. While some TSBs exist for engine-related issues like catalytic converter efficiency codes (P0420), none address cracking or gasket failure.
- Common Cause of Failure: For the CR-Z, the most likely cause of cylinder head damage is severe engine overheating. This can happen due to a separate cooling system failure, such as a bad water pump, thermostat, or a major coolant leak that was not addressed promptly.
Pro Tip: If you are diagnosing a persistent misfire (P0301-P0304), always start with the basics before suspecting the cylinder head. Swap the ignition coil and spark plug from the misfiring cylinder to a different cylinder. If the misfire code follows the coil or plug, the problem is that component, not the head itself.
Buying a Used 2012-2016 CR-Z Cylinder Head: What to Check
Since new aftermarket cylinder heads for the CR-Z are not commonly available, a quality used OEM head is often the most practical and cost-effective solution. However, you must inspect a used head carefully before installation.
Physical Inspection Checklist:
- Check for Warping: This is the most critical check. Place a precision straightedge across the deck surface of the head (the flat part that mates with the engine block). Try to slide a feeler gauge under it at various points. If you can fit a gauge thicker than 0.002-0.004 inches, the head is warped and needs to be resurfaced or replaced.
- Inspect for Cracks: Look very closely for hairline cracks. Common crack locations are between the valve seats, near spark plug holes, and around exhaust ports. A machine shop can perform a more thorough pressure test or dye penetrant test to find hidden cracks.
- Examine Camshaft Journals: If the head includes camshafts, inspect the journals (the smooth surfaces where the camshafts sit) and the cam caps for deep scratches, scoring, or signs of heat damage (discoloration). Damage here suggests the engine suffered from oil starvation.
- Look for Corrosion: Check the coolant passages for heavy corrosion or pitting, which can indicate poor maintenance and may compromise sealing.
- Verify All Threads: Make sure all threaded holes for bolts (exhaust manifold, intake manifold, cam caps) are clean and not stripped or damaged.
Warning: Always have a used cylinder head professionally inspected and resurfaced by a qualified machine shop before you install it. The small cost of a resurfacing job is cheap insurance against having to do the entire labor-intensive job a second time due to a poor seal.
Replacement Cost & Difficulty
Replacing a cylinder head is a complex and expensive job that is not recommended for a DIY mechanic without significant experience. It requires partial disassembly of the engine, specialized tools for timing, and careful adherence to torque specifications.
Installation Difficulty: 5 out of 5 (Expert level)
DIY Feasible: No, for most mechanics.
Estimated Time: 10-15 hours
| Part/Service | Estimated Cost | Notes |
|---|---|---|
| New OEM Cylinder Head (Bare) | $2,500 - $2,900 | Part number 12200-RTW-A00. Prices from online Honda dealers. |
| New OEM Cylinder Head (Assembly) | $5,500 - $7,400 | Part number 10003-RTW-A01. Includes valves, springs, etc. |
| New Aftermarket Cylinder Head | Not Commonly Available | Only related components like gaskets and bolts are typically sold aftermarket. |
| Used OEM Cylinder Head | $300 - $900+ | Highly variable based on condition, mileage, and whether it includes camshafts. |
| Remanufactured Cylinder Head | $600 - $1,200+ | Availability may be limited. Price depends on core charges and included components. |
| Shop Labor | $1,000 - $1,500 | Based on 10-15 hours at a typical shop rate. |
| Related Parts | $200 - $500 | You MUST also replace the head gasket, head bolts (they are single-use), thermostat, and all related fluids. It's also wise to replace the water pump and timing components while the engine is apart. |
Frequently Asked Questions (FAQ)
Do I have to get a used cylinder head resurfaced?
Yes, it is highly recommended. Even a seemingly flat head can have minor imperfections that will prevent the new head gasket from sealing properly. A machine shop will mill a tiny layer off the surface to ensure it is perfectly flat, which is critical for a long-lasting repair.
Can I reuse my old head bolts?
No. The cylinder head bolts on the CR-Z, like most modern engines, are Torque-to-Yield (TTY) bolts. They are designed to permanently stretch when torqued to specification. Reusing them will result in improper clamping force and almost certain failure of the new head gasket.
What other parts should I replace at the same time?
At a minimum, you must replace the head gasket, head bolts, and engine coolant. It is strongly recommended to also replace the thermostat, water pump, timing chain and tensioners, and valve cover gasket, as the labor to access them is already done.
Is a warped cylinder head repairable?
Sometimes. If the warpage is minor, a machine shop can resurface it. However, if the head is severely warped from extreme overheating, too much material would need to be removed, which can alter the engine's compression ratio and cause other problems. In severe cases, the head must be replaced.
Technical Specifications
OEM Part Numbers: 10003-RTW-010 10003-RTW-A00 10003-RTW-A01 12200-RB0-G00 12200-RP3-A00 12200-RTW-A00
Fits 1.5L LEA SOHC i-VTEC Hybrid engines. The cylinder head is made of aluminum alloy. Always verify compatibility with your vehicle's VIN, as minor internal component variations may exist.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Honda CR-Z: