Diagnostic Message

[Mike D]

The following diagnostic message warning showed up on my 2014 G23: DTC 134: EGO1 open / lazy SPN 3217 FMI 5.

Any idea on what the issue is?

[dklauer]

Same code just came up on mine....what did you find out?

[wakerider107]

This code is definitely over my head, but here is the explanation.

[Mike Fenton]

Same code just came up on mine....what did you find out?

Did you get yours fixed.. I had this same code over the weekend. Im thinking its the o2 sensors.

[dklauer]

My alternator broke off so that was the issue....got it fixed and all good!

[charlesml3]

My alternator broke off so that was the issue....got it fixed and all good!

That makes no sense whatsoever. Your alternator broke off? Did it somehow kill the O2 sensor when it did?

[dklauer]

Yes, it disconnected the sensor connection when it broke off. The two metal bolts literally sheered off from the engine block and the belt came off. We got two screws put it back on and the warning was still up because we didn't connect the sensor. Connected the cord and warning light went off and all good.

[charlesml3]

OK but that's a very corner case. I've never even heard of an alternator shearing off the bolts.

It is highly unlikely this is the same problem that Mike D is describing. Most likely he either has a bad O2 sensor or a connection to it.

[mpost]

OK but that's a very corner case. I've never even heard of an alternator shearing off the bolts.

It is highly unlikely this is the same problem that Mike D is describing. Most likely he either has a bad O2 sensor or a connection to it.

https://www.planetnautique.com/vb5/f...nator-bolt-zr6

[Boostwake]

So, in simple terms where is this sensor situated in the boat ,is it doing any damage,and where do I get one?

[jpwhit]

The sensor is screwed in the Exhaust Manifold / Catalytic converter assembly. There are 4 sensors in total, two in each manifold. On each side, there is one before the catalytic converter and one after the catalytic converter. The one before is used to control the engine's fuel mixture. The one after is to verify the proper functioning of the catalytic converter and is essentially only an emission control device to notify if the catalytic converter is not functioning.

If the one before the catalytic converter is not working property, it can result in damage to the catalytic converter. That's because if the O2 sensor is not functioning, the ECM defaults to a generic fuel mixture map which will be a little rich to assure the engine isn't damaged from running overly lean. The extra fuel will burn in the catalytic converter and generate extra heat and can burn up the catalytic converter. You don't want to do that, because they are very expensive,

[jpwhit]

You can see the before catalytic O2 sensor in this picture. It's the silver thing that looks like a spark plug with a black wire going to it on the front of the left side exhaust manifold / catalytic converter assembly.