Engine Oil Leaks Due to Porous Engine Block Casting on Honda Accord

The engine may develop and oil leak due to a porous engine block casting. The repair procedure is dependent on where the leak is located. Honda has released a service bulletin covering model years 1998-2003. Honda may offer assistance with repairs, determined on a case by case basis.

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Average mileage: 159,799 (21,000–292,000)
Engines affected: 2.3L 4 Cylinder, 2.4L 4 Cylinder, 3.0L V6
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004
109 people reported this problem
problem details
1999 Honda Accord - 3.0L V6 140,000 mi,
I was told by the Honda dealer that my Honda has a porous block and the only way to fix it is to replace the engine with a used engine because they can not get a new engine. How do I know the used engine will not have a porous block?
2000 Honda Accord - 2.3L 4 Cylinder 145,000 mi,
I have had this Honda Accord now for a year and a half, with no problems, never overheated, excellent mileage etc. and 3 weeks ago I discovered a substance resembling molasses in the coolant expansion reservoir, then I opened the radiator cap and discovered more of that substance in the radiator, checked the engine oil level and it dropped closer to the lower dot. I always ensure that the oil level is between the 2 dots The engine oil is super clean no trace of any coolant, so I am assuming there is a crack in the engine. I constantly monitor the engine oil level and top it off as needed ( approx 1 quart per 1000 kilometers), and I also empty out the expansion bottle into a waste oil container once a week and fill it with fresh coolant . The upper radiator hose was also replaced because it started to deteriorate. I am not sure what to do to fix the problem, other than replace the engine, what other solution is there ? thanks Carlos
2001 Honda Accord - 2.3L 4 Cylinder 65,000 mi,
Has not been fixed, cannot find where leak is. Oil all underside of engine. Leaks pretty bad.
1999 Honda Accord - 2.3L 4 Cylinder 190,000 mi,
Replaced head gasket. Still find oil in radiator. Must be a leak in the block. I wish Honda would admit the problem so there could be a diagnostic. A lot of people have wasted a lot of repair money on a design flaw that has no fix.
2000 Honda Accord - 2.3L 4 Cylinder 84,000 mi,
We just got this car and now, we have oil in the cooling system. I was told I have a "porous" engine block and need to replace the engine. Also, the check engine light is on and I was told that I may need to replace the computer. I was told "this is a problem car". This is all adding up to close to $4,000! I am wondering should I keep this car or trade it for something without so many problems?
1998 Honda Accord - 2.3L 4 Cylinder 198,000 mi,
My '98 accord leaks oil out as fast as you put it in. My mechanic says it's not worth fixing. I'm wondering if pourous block is to blame. Oil in coolant reservior. New head gasket.
1999 Honda Accord - 2.3L 4 Cylinder 200,000 mi,
Have had to replace head along with heater core and have to flush out oil in cooling system. Quite frustrating. I certainly would not re-sale this car for more than 500 to 1000 dollars. Bought it for around 4000 a few years ago. I don't think as highly of Honda as I used to. Will just have to keep flushing it out until we find another vehicle that is dependable.
2003 Honda Accord - 3.0L V6 64,000 mi,
I just recent noticed oil leak on my Honda 2003 Accord Ex V6. I was told by Honda service team that they were not 100% sure until they have to remove the transmission to determine the cause for sure. With 64K miles and good maintenance record from Honda service. I was told that could be cause by engine block which may cause 5-6k to replace the engine. I am kind disappointed with the news, but that was my bad luck then...
2002 Honda Accord - 2.3L 4 Cylinder 21,000 mi,
oil started to leak into the coolant. The leakage is getting worse with time
1999 Honda Accord - 2.3L 4 Cylinder 135,000 mi,
Oil in coolant; head gasket is fine; will require new block.
2003 Honda Accord - 2.4L 4 Cylinder
My have engine oil leak
1999 Honda Accord - 2.3L 4 Cylinder 116,000 mi,
Told by dealer that engine has bad / porous casting that lets engine oil and coolant mix once the engine heats up. Repair costs ~4000
2002 Honda Accord - 2.3L 4 Cylinder 146,786 mi,
Found oil in the coolant system. So I drain all the oil leave the drain plug off put 15 psi air pressure leave it over night found 1 litre next morning Found block has little crack.
2003 Honda Accord - 2.4L 4 Cylinder
Oil leakage getting progressively worse. Have had all gaskets and valves replaced. The oil light goes off for about a week and then comes back on. Going thru about 2 was of oil every 3-4 days.
1998 Honda Accord - 2.3L 4 Cylinder 250,000 mi,
Oil is leaking from bottom ... Not sure where leak is coming from .. It has always used oil but not very bad then suddenly started leaking a lot when car is running .. Don't leak if car is off
1998 Honda Accord - 2.3L 4 Cylinder 135,000 mi,
Oil in coolant system. Drained engine oil; no coolant in drained oil. Mechanic pressure tested system. No problem identified. Head gasket intact. Letter to Mr. Takuji Yamada, President, Honda North America, Inc, Torrance, CA, referred to American Honda, Regional Case Manager, Customer Service Representative who called me. Representative feigned an understanding of issue involve, although acknowledging my correspondence to Mr. Yamada. Representative provided scripted recitation professing no knowledge of the documented porous nature of the F23A1 engine. The representative could have cared less, which is probably based in Honda's corporate culture of not responding to consumer post-purchase issues. Will never purchase another Honda product.
2002 Honda Accord - 2.3L 4 Cylinder
Engine started leaking oil at 93,000 miles and it has been a continuous problem to present with small increase over time to present
2000 Honda Accord - 2.3L 4 Cylinder 140,000 mi,
Oil in radiator, mechanic said these engines are known for having pourus block issues. No fix other than block or engine replacement. I put block seal in it every couple of months after draining and flushing the system. I notice leaking start back a month after reaplieing block seal.
1998 Honda Accord - 3.0L V6 147,000 mi,
Seems to burn oil at a serious rate at about a quart a week
1998 Honda Accord - 2.3L 4 Cylinder 158,000 mi,
Oil in coolant, changed radiator, flushed, new coolant, problem came back. Had head gasket check, which was ok. Flushed again, put new radiator hoses on, put new coolant in, looks like it is back again. Car doesn't run hot and doesn't seem to be using oil in transmission or engine, Please help if you can, thanks, Dennis Zach