2015 Moomba mondo surf edition \4238 engine fault code question

Each time we go out and fill the ballast up and begin to surf the check engine light goes on. Per a thread I read on here I replaced both O2 sensors. I am now trying to burn through the remaining gas in the tank running laps around our lake, just in case it is a gas issue. No check engine light when I am running 30 mph to burn gas. I am now going to fill the tank with 91 non-ethanol gas. Again, the orange check engine only comes on when the motor is under high stress, surfing for example. Any other thoughts on what it could be? I do not have the correct tools or knowledge to check the fuel line pressure.

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Originally Posted by Wdavid

Each time we go out and fill the ballast up and begin to surf the check engine light goes on. Per a thread I read on here I replaced both O2 sensors. I am now trying to burn through the remaining gas in the tank running laps around our lake, just in case it is a gas issue. No check engine light when I am running 30 mph to burn gas. I am now going to fill the tank with 91 non-ethanol gas. Again, the orange check engine only comes on when the motor is under high stress, surfing for example. Any other thoughts on what it could be? I do not have the correct tools or knowledge to check the fuel line pressure.

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Go around and check all exhaust connections. If you changed the O2 sensor and still getting the code, you have a leak allowing fresh air in. Tighten all the V-band clamps.

[QUOTE=Holdmybeer;371452]Go around and check all exhaust connections. If you changed the O2 sensor and still getting the code, you have a leak allowing fresh air in. Tighten all the V-band clamps.[/QUOTE

I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!

Is it possible it’s a collapsed CAT matrix? If I remember there were issues with Indmar CATs during those years in which the matrix would collapse giving O2 sensor faults and a number of other misc codes.

If you can visualize the honeycomb, see if it’s intact.


Currently boatless

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Originally Posted by Holdmybeer

Go around and check all exhaust connections. If you changed the O2 sensor and still getting the code, you have a leak allowing fresh air in. Tighten all the V-band clamps.

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I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!

I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!

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Originally Posted by Wdavid

I hate to ask the obvious, but can you specifically point out to me what clamps...as I look at the engine there seem to be a lot! Sorry. My engine experience is limited!

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Check these connections.
Back of the engine can access through rear lockers/v-drive doghouse. CATS are the canisters on the exhaust.

Attachment 29940

Awesome! Thank you.

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Originally Posted by Wdavid

Awesome! Thank you.

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Just making sure you checked ALL the o2 sensors, there's 4, 2 before and 2 after.

Usually it's the after 02s that go bad and I got easily got confused and change the wrong one. :)

Sorry the ones on the exhaust manifold.

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Originally Posted by parrothd

Just making sure you check ALL the o2 sensors, there's 4, 2 before and 2 after.

Usually it's the after 02s that go bad and I got easily got confused and change the wrong one. :)

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Also if the light comes on when you fill the ballast it means the wall is collapsing into the engine and pressing on the O2 sensor wire.