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Hi, helping out a friend. He has ses light on that will not reset. I scanned the car and it has two codes. P1163 I graphed the upstream o2 sensor and it does not appear to be switching at all. It is a steady voltage. I don’t believe it was going into closed loop. I scanned this quite a while ago so I don’t remember exactly. There is some information on the internet that this May not be an o2 cell issue, some information talks about replacing a CPU board. (The ECM?) he read something about a slow to heat recall. Just need help sorting this out from one of the honda pros.
He is concerned about the difference between a 4 wire and a 5 wire o2 cell. I am not familiar with this car so not sure what the issue is there. He is having difficulty finding a 5 wire o2 cell. 4 wire cells are available. Also, what brands should he avoid on this car. The OEM cell is too expensive.
He also has a p0401 egr flow code. There are a few internet videos of how to clean out the egr system. He is going to try that this weekend. Any advice would be appreciated. He thinks it is a 1.6 liter engine.
One thing is, he gets great gas mileage and is afraid that fixing the codes will affect that. This has been like this for a lone time, so I am concerned about cat damage. He is concerned about the environment, so he wants to be a good citizen and fix the emission controls.
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see if this helps.
http://www.justanswer.com/honda/19sk1-1998-honda-civic-hx-160-000-miles.html
It’s not often Honda PCM’s go bad. In fact it’s very rare. That said, Honda’s don’t like aftermarket parts too much. I would see if you could find a Denso sensor as they also make the OE part. I believe it’s a 4 wire sensor. I don’t recall seeing 5 wire sensors on 99’s.
Also, if it’s a manual transmission car, there is no EGR. They only put EGR’s on the automatics as far as I know. Also, that engine doesn’t have the same set up with EGR passages as some other engines. Therefore cleaning the passages may be tricky. You may want to check the vacuum input to the EGR. Those years had issue with the EGR solenoid on the firewall causing issues with EGR operation.
Good luck and keep us posted.
The O2 sensor is NTK-L1h is what is visible as the part number. We think is a NTK-L1H1. The wire colors are Black, Blue, Grey, White, Yellow as best as he can tell. I think it is a Wideband. I know when I graphed it on my scanner there was no movement of the waveform. It just stayed steady, I do have a Fluke digital scope meter, but am not familiar with a Wide Band O2 or what the waveform should look like. If that is what this cell is.
It is a manual transmission. I am not sure I understand how it can have an EGR flow code and no ERG valve?
vin 1HGEJ7128XL028831 if that helps.
Just out of curiosity, is this vehicle in the US or somewhere else? Perhaps you have a late 99. It was around 2000 that they changed things to more updated systems. That said, if you don’t see a waveform then the sensor is likely faulty. There could also be a connection issue or wiring issue as well.
You can check the engine to see if it has an EGR. If it does, then I would not replace the valve so much as look for ports to clean as you suggested. P0401’s mean that the EGR is likely working but it’s not detecting flow.
Something else I thought of on the EGR. Honda uses the O2 sensor to monitor EGR flow. If you have an O2 problem like you do, then it might misinterpret the information as an EGR problem.
Keep us posted.
I looked at the car myself today, it is for sure a 5 wire sensor. From the NTK part number it is a wide band. My friend contacted the dealer here in Kansas and they said they could not tell if it is the correct sensor. They would need to order one and see what came in. (I think that’s very weird). I work on mostly GM products and if you give the dealer the VIN they can pull the correct part number. After researching the wide band I didn’t find a great way to test them. Some people use propane and watch the Short Term Fuel Trim. I also saw some that used a normal scanner knowing the voltages would not be right. My understanding is a Wide Band sensor varies the current based on oxygen concentration. I am wondering if you could look at it with a low current probe. Anyway, like Eric said there should be some movement on a scanner waveform and based on that I am going to recommend to him to change the sensor. They are very expensive so we were trying to test it but sometimes you just have to go with what you’ve got. Thanks.
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