P0051 code
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Grand HDF Member
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From: Dubuque, IA
P0051 code
Details and pertinent info. 2013 flstc 103 with s&s 570s, Rush slip ons, Outlaw 587 AC, SE Pro Super Tuner. It was dyno tuned after the cams tho I've since tweaked it.
I just pulled the heads, cleaned 95% of the carbon off the pistons from the previous owner running it 29,000 miles with the stock crankcase venting into the intake, and reinstalled everything using .030 head gaskets to tighten the squish. Fired it up and I get the P0051 code. Doesn't seem to want to clear either. Did my 02 sensor take a dump? Am I running lean now because of the tighten squish and bump in compression? I'm running open loop with no cells leaner than 13.5 in the AFR table. I think that covers it. Thoughts?
The fact it won't clear tells me it shorted?
I just pulled the heads, cleaned 95% of the carbon off the pistons from the previous owner running it 29,000 miles with the stock crankcase venting into the intake, and reinstalled everything using .030 head gaskets to tighten the squish. Fired it up and I get the P0051 code. Doesn't seem to want to clear either. Did my 02 sensor take a dump? Am I running lean now because of the tighten squish and bump in compression? I'm running open loop with no cells leaner than 13.5 in the AFR table. I think that covers it. Thoughts?
The fact it won't clear tells me it shorted?
Last edited by 60Gunner; Oct 11, 2020 at 01:12 PM.
Stellar HDF Member
Joined: Jun 2018
Posts: 2,295
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From: WI
1st question.....how are you running open loop 13.5 afr,s? 2nd, did you check continuity from o2 connector to ECM? 3rd, check ohms value for front and rear o2 sensors and compare readings. lastly try swapping O2 sensors front to back and see if fault code follows. You had to disturb physical connection from O2 sensor to ECM connection when you removed exhaust.... Check electrical connector from O2 sensor for corrosion, clean as necessary.... hope this helps
Thread Starter
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Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
1st question.....how are you running open loop 13.5 afr,s? 2nd, did you check continuity from o2 connector to ECM? 3rd, check ohms value for front and rear o2 sensors and compare readings. lastly try swapping O2 sensors front to back and see if fault code follows. You had to disturb physical connection from O2 sensor to ECM connection when you removed exhaust.... Check electrical connector from O2 sensor for corrosion, clean as necessary.... hope this helps
I'm running 13.5 AFRs because that's what my target is and my VEs are/were dialed in to within 1%.
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Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
I know they were spot on before doing the .030 gasket. That will change the VEs a little but not much. Probably not enough to really change the AFR much even. It takes like 1 0% to equal 1 AFR point. But I'll put a small closed loop area back in just to get the VE tables dialed in again, then it's right back to open loop. I have no use for NB closed loop.
That's why I hate to buy a new sensor but oh well.
That's why I hate to buy a new sensor but oh well.
Last edited by 60Gunner; Nov 12, 2020 at 08:51 PM.
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