Mercruiser 4.5 Fault Code
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Hello,
New to the forum! I have a 2017 Searay SPX 210 with the Mercruiser 4.5 (200HP). It has been a horrible boating season thus far. Early June, service light came on. Took out of the water later that month and dealer said 1 of the trim senders assemblies went bad (3 wire/1 puck version). Got it back from the dealer, launched it, and not even 5 minutes later, light was back on.
This time, I decided to purchase the Mercury Vessel View Mobile, instead of the $100 per time computer scan from the dealer. Code is reading as follows:
851-11: O2 sensor Port S2
Does anyone know if this is the pre or post CAT sensor or should I just do trial and error and replace one to see if it corrects? Is it possible it's not even one of these sensors at all?
New to the forum! I have a 2017 Searay SPX 210 with the Mercruiser 4.5 (200HP). It has been a horrible boating season thus far. Early June, service light came on. Took out of the water later that month and dealer said 1 of the trim senders assemblies went bad (3 wire/1 puck version). Got it back from the dealer, launched it, and not even 5 minutes later, light was back on.
This time, I decided to purchase the Mercury Vessel View Mobile, instead of the $100 per time computer scan from the dealer. Code is reading as follows:
851-11: O2 sensor Port S2
Does anyone know if this is the pre or post CAT sensor or should I just do trial and error and replace one to see if it corrects? Is it possible it's not even one of these sensors at all?
#2
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851 is post cat and the 11 means lean condition. No offense but not that much info to be had for production catalyst marine engines on the forums. I work on these and been thru many training programs from the OEMs.
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Thank you for the info! I ordered the part and will swap it out when it comes. Hopefully this is it and not something deeper in-bedded.
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unfortunately right now I’m in the process of a warranty transfer so until it’s under my name, they won’t touch it. I could wait as it’s a non critical, but for $100 and piece of mind, if it’s just the sensor, i can handle that.
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