Oxygen sensor in 2011 sundeck 240 with 5.7 mercruiser

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.

Can you tell me who the company is that sells the module thats tricks the computer ... $450 part? Thanks
 
CPPerformance. I just had another pos oxygen sensor rot out, 18 months completely covered in corrosion, failed "stuck lean". I am done. Fking EPA what environmental cost is it to manufacture an oxygen sensor genius EPA. I put a piece of tape over horn can't hear it, lol. Probably just run like this. I scan gauges for oil pressure, engine temp and my last boat didn't even have a remote lube reservoir, did find for 28 years....
 
We have buzzers for various things on the rigs at work.

A Snapple cap fits perfectly over them and does a nice job of silencing the beeping.
 
Do you tell people to ignore the check engine light in their car also?

If the motor is performing well, I usually tell them to remove the bulb and cut the alarm wire.
 
If the check engine light is on, the engine is NOT performing well, period!

You should be ashamed of yourself.
Wait a minute, guys. There are two sides to this... and both of you are correct. CEL's light up because a sensor thinks there is an issue - not necessarily because there is an actual issue.

The question is, what caused the sensor to think there is an issue. Is it a "real" issue, or is it a false positive such as a flaky sensor. If it is determined to be a flaky sensor, then disabling the CEL is valid - but one must revert back to actively monitoring the engine the good 'ol fashioned way. But then, the flip side, is that if a "true" issue does pop up and it is not noticed (manual monitoring), then further damage can be done.
 
Wonderful GM used to have anti-lock break light come on between 80K and 85K miles. Nice $900 bill. No thanks bulb came out. Told people if light comes on get out of car its on fire. Same with O2 sensors and catalyst. Keep the front and ignore catalyst and rear oxygen sensor. If you want alarm then buy module from CPPerformance if not cut horn. Enjoy boat.
 

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