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2017 Accord O2 sensor troubleshooting

 
Old 03-03-2018, 10:19 AM
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Default 2017 Accord O2 sensor troubleshooting

hey guys! got a head scratcher and need some help with it... got this 2017 Accord Sport (4cyl), on 4,400 miles on her with a check engine light throwing two codes: P0135 and P0498, O2 b1 s1 reads no voltage according to Torque app, sensor b1 s2 does show voltage. The car is a theft recovery and has had battery cable cut (that's fixed) and some fuses thrown out (not sure if we got all of them) otherwise in tact, they probably did that to disable the alarm or just to sell the battery. also missing cover for fuse block with the fuse diagram under the hood and so far the fuses that we checked seem to be okay.

I need help figuring out if there is a fuse for the 02 sensor and it's location, or if someone has resistance ohms expected on the o2 sensor so I can measure if it's working properly. Same goes for the EVAP circuit... maybe one and the same or closely related..

Any pointers? Thanks in advance!
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UPDATE: Resolved!
After getting all the missing fuses in, testing the circuit for the oxygen sensor showed no voltage coming from from the battery. I pulled all the relays in the under hood fusebox and started testing the circuit for continuity and found that one of the relays tied to fuse "FL Sub" (15amp) was not working. Replaced the relay with a new one and reset ECU codes. No more check engine light.

Last edited by MissingLugNut; 03-12-2018 at 11:26 AM.
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Old 03-05-2018, 07:33 AM
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Default Re: 2017 Accord O2 sensor troubleshooting

Vehicles 3 years and newer are under warranty,so aftermarket service information available is scarce to nonexistent.

There is only 1 reliable source for that info online and that is from Honda. For a measly 10 bucks a day you can access Hondas website and find all the info you need for your 2017.

https://techinfo.honda.com/rjanisis/logon.aspx
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Old 03-05-2018, 08:54 AM
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Icon3 Re: 2017 Accord O2 sensor troubleshooting

Originally Posted by DCFIVER View Post
Vehicles 3 years and newer are under warranty,so aftermarket service information available is scarce to nonexistent.

There is only 1 reliable source for that info online and that is from Honda. For a measly 10 bucks a day you can access Hondas website and find all the info you need for your 2017.

https://techinfo.honda.com/rjanisis/logon.aspx
Thanks for the Tip! Good information, didn't know that was available! I'll gladly pay to get access to accurate Honda data.

for anyone else reading this in hopes to find the answer, I think I've pieced it together from similar issues reported on various Hondas when both of those codes are thrown. In most cases it's either the fuse that controls the heater element on the o2 sensor or the it's the actual o2 sensor gone bad (more rare). I'll report back when i have the correct fuse mapping for this car and try it, also went ahead and ordered the pre-cat o2 sensor in case that's not it.
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Old 04-10-2018, 03:08 PM
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Default Re: 2017 Accord O2 sensor troubleshooting

Did you find out the fuse...my tech data says it’s A11 in the engine compartment, but I’m not sure if it made a difference in my testing. Is the fuse before the relay? Can you visually inspect a relay to tell if the bad? Thanks for any info and updates...

Last edited by CrazyBoom; 04-11-2018 at 05:21 AM.
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Old 04-10-2018, 04:24 PM
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Default Re: 2017 Accord O2 sensor troubleshooting

Maybe you have a v6 or hybrid? In the engine bay? In my accord fuse #11 is hazard lights. Check fuse #7 labeled FL SUB in the manual.

the relay in my case had a hole in it, Iím guessing from someone prying it with a screwdriver. It was identical to the horn relay but was 3 one if memory serves me right from the back of the box in the same row as horn

These are the fuse and relay I mentioned.
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Old 04-11-2018, 05:27 AM
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Icon7 Re: 2017 Accord O2 sensor troubleshooting

Thanks for the info...

I have a 2015 Sport, L4... Iím on the road and canít remember exactly which fuse I checked. I will look when I return home and will double check than it was the right one. I should have time to use the multi-meter if I donít find any obvious problems....
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Old 04-15-2018, 05:33 AM
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Default Re: 2017 Accord O2 sensor troubleshooting

As a follow through...

The fuse position is absolutely correct ...I was mistaken and position 7 (15A) is correct. My repair outline lists the first relay (one to the far right as pictured above) as the PGM-FI sub relay, and outlined in the attached pic...

For good measure I replaced the fuse, checked both relays, visually inspected the wiring from the fuse box to the A/F Ratio Sensor wiring, and "erased" the codes multiple times before light/codes disappeared.

MX problem resolved, but I'm not exactly sure which step(s) solved the problem. It's significant to note that the fuse at position 7 appeared fine but I replaced it anyways...

Thanks for all the help!
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