Oxygen sensor in 2011 sundeck 240 with 5.7 mercruiser

S

Shawn16505

New Member
Jun 7, 2015
3
Erie,pa
Boat Info
2011 sundeck 240
Engines
5.7 mercruiser bravo
I just purchased a 2011 sundeck 240 with 5.7 mercruiser. Only 60 hours on the engine. I previously owned a 1999 sundeck 210. 700 hours on the mercruiser 5.0 without a problem. First time boating in the 240, I got an engine alarm that there was an exhaust issue, and something about a bad oxygen sensor. Seems as if this is an ongoing problem with this model. Any advice? The boat runs great
 
Do you have riser extensions between the manifold and the riser/elbow
 
I just bought the boat 2 weeks ago. Unfortunately I don't have any service records. I'm having my local mechanic in Erie look into it. Unfortunately the sea ray dealer in Pittsburg is acting very shady. They sold the boat new and brokered the boat 3 years later. Only 60 hours on the engine. They claim they have no service records. From what I have read, this is a common problem. Any advice would be appreciated. Does sea Ray have a national customer service rep? Thanks in advance
 
For what it's worth, my 5.0MPI had a similar issue when I first bought it. I had about 140 hours on it at the time. After cruising for about an hour I would get a catalyst error on the starboard side.

The dealer started off by replacing the O2 sensors, which didn't resolve the issue. The next logical thing to replace was the catalytic converter, which fixed the issue. I have put around another 100 hours on the boat since then and have not had a single issue.

I know there is also a lot of talk about problems with the O2 sensors getting wet due to the height of the risers. In my case, it was just a bad catalyst.

Do you have a warranty on this boat?
 
No I don't, but thanks for your input. I will definitely use this info when I talk to the sea Ray dealer who brokered the boat
 
Shawn16505 said:
No I don't, but thanks for your input. I will definitely use this info when I talk to the sea Ray dealer who brokered the boat
Click to expand...

I didn't either. I was very lucky though, MarineMax took care of the diagnostics and repair since the issue arose the same weekend I took delivery.

My suggestion to you would be to test swapping O2 sensors to see if the problems moves with the sensor or stays on the same side of the engine. If the error comes back on the same side I would then swap the catalysts between the starboard and port sides. If the problem moves with the catalyst then you know that is the issue. That way you aren't unnecessarily purchasing new parts.

The frustrating part will be that each time the error comes back you'll need to have someone with the right hardware clear the error code. Does your vessel have the smartcraft gauges that display the error code text?
 
I just picked up a 2010 SeaRay 260 Sundeck. Had 77 hours on it and runs/looks like new. Mercruiser 350 MAG MPI Ran it for 3 hours last Fri, Sat, Sun. On Sunday I was on a 20 mile cruise down the lake and received
"STBD system fault 19 Catalyst. Catalyst is not working properly. Emission control problem. Service engine soon. " My research tells me and chatting with a mechanic tells me it is very likely it is the starboard O2 sensor and others seem to have the issue as well. This was a brokered boat and no maintenance records other than annual winterization and annual oil & gear changes. Does anyone know of a retro fix/solution? I'll change the sensor on it, but don't want to continue to get O2 faults. I've heard of adjusting the riser height or adding a spacer to the O2 sensor itself. Mechanic said the smart craft will auto reset once issue is resolved.

Any thoughts from others aside from the catalyst replacement?

Thanks much
 
When I had this same issue replacing the catalyst ultimately solved the problem.

A good starting point would be to reset the error code and swap O2 sensors between manifolds. If/when the alert comes back you can see whether the problem followed the sensor or stayed on the same side of the engine.
 
vortmaximum said:
Mechanic said the smart craft will auto reset once issue is resolved.
Click to expand...

This wasn't what I experienced. It seems that this particular type of error will not go away until the alert is reset. From what I was told once the threshold value that triggers this alert is reached, the alert will persist even after the threshold is no longer exceeded.
 
Probably......As I'm a newb at boating, I'm going to "Pay the Man" to hook up the CDS, get a report and then have him reset. I think I'm going to research a CDS system, but already have the smartcraft gauge that gives me a limited text read out, would like something that gives more information and allows a more detailed report and clearing of the alarm. Seems crazy to drop $85 each time an alarm goes off to see what actually caused it and reset it. I think the boat sat this past summer and hoping that 3 days of running it caused a sensor to trip. Great little boat for zipping around.
 
You'll get it figured out, don't let it frustrate you. As far as possible problems to find after purchasing a new boat this is definitely one of the better ones to have.

It took a couple months to get my issues ironed out but our boat has run without a hitch since then.

Good luck and enjoy!
 
FYI, if anyone else runs into it. It was an O2 sensor, but the pre CAT O2 sensor, not the post CAT O2 sensor I was told the SC 19 error was telling me.
 
Shawn16505 said:
I just purchased a 2011 sundeck 240 with 5.7 mercruiser. Only 60 hours on the engine. I previously owned a 1999 sundeck 210. 700 hours on the mercruiser 5.0 without a problem. First time boating in the 240, I got an engine alarm that there was an exhaust issue, and something about a bad oxygen sensor. Seems as if this is an ongoing problem with this model. Any advice? The boat runs great
Click to expand...

Did you ever get this issue resolved? I am having the same problem with my 2012 Sea Ray Sundeck 240. A new sensor was put in and code reset. 3 hours later the code is back on. What was done to your boat to fix it? Who did the repairs (Name). I am also located in Erie and if you resolved your problem I would like to take mine to the same person.
 
In most of the cases the failure was the result of moisture getting to the sensor
If your not going into guardian mode and the motor is performing well, ignore the sensor
 
Bt Doctur said:
In most of the cases the failure was the result of moisture getting to the sensor
If your not going into guardian mode and the motor is performing well, ignore the sensor
Click to expand...

Thank you. However, if it isn't moisture what else could it be?
 
the only thing thats supposed to be in the exaust flow is exaust otherwise the sensor wont work or be damaged,they definitely hate water, fresh or salt
The bigger issue were the cats getting wet/damp and failing
 
Pre cat oxygen sensors are important they determine fuel ratio. Post cat oxygen sensor only determines if catalyst working. Who gives a sheet. You can run without post cat oxygen sensors and the boat will run perfect but you will get an alarm. Your choices are to get slowly bled my your marine mechanic on a useless environmental requirement or run without post cat o2 sensors. The post cat o2 sensors are close to where the exhaust gas and water mix so the live in a horrible environment, the pre cat live in nice hot exhaust gas. A company makes a module you can plug in that tricks the computer into thinking post cats are installed and you don't get an alarm. About $450. With that you can easily retrofit back to old style manifolds if necessary. You can eliminate catalyst. This is what has killed inboard engines the EPA. The manifolds, catalyst add about $4K to the price of an engine. Now outboards are more cost effective. Max Volt Catalyst Eliminator Computer is what you want if you like plug and play.
 
You must log in or register to reply here.

Forum statistics

Threads
113,114
Messages
1,426,312
Members
61,027
Latest member
NeilS
Back
Top