PicoScope 7 Automotive
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Bosch 13751
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raul.garcia.sr
- Newbie
- Posts: 2
- Joined: Sun Apr 12, 2020 5:10 am
Bosch 13751
I have a 2005 vw Passat 1.8T that belongs to my daughter, (but in my name.)
She had a CEL but ignored it until registration renewal came around.
Had a P0174 so she just replace the o2 (Bosch 17351) and headed off to emissions testing, and it failed and she couldn't fix it within the 2 week time limit.
So she handed me the keys and said, it's your car, you fix it.
To make a long story short I reinstalled the old sensor and still got P0130 almost immediately. I wasn't experiencing any of the symptoms that could set this code. I wasn't accepting that 2 sensors would give me the same code.
So, I take my Audi A4 2.0T for a logging of the relevant O2 pids, and did the same on the Passat for comparing.
The only difference between the 2 was that the Passat had no reading for the B!SI resistance PID.
That lead me to search for technical articles pertaining to the Bosch 1375, specifically, the Pico article" Testing the Bosch LSU 4.2 broadband oxygen sensor".
I did all the testing of the sensors & PCM as directed, and didn't find any issues.
In testing the PCM side, and even though my measurements were within specs, I was not satisfied, as the results were inconclusive because the results were that the O2 and the PCM were good.
I then accepted that the O2 was good so, either the wiring, or the PCM are bad. So I proceeded as if the PCM 2,6 to chassis ground/battery positive had a short.
Disconnected the positive cable and did the test and the 2,6 to chassis read 1.6K, 1.7K ohms respectively, and to the positive when connected a dead short to either pin, I didn't expect this because the resistance across 2,6 was 62.2 ohms well within specs.
So my question is where did I go wrong, or just did I just confuse myself?
She had a CEL but ignored it until registration renewal came around.
Had a P0174 so she just replace the o2 (Bosch 17351) and headed off to emissions testing, and it failed and she couldn't fix it within the 2 week time limit.
So she handed me the keys and said, it's your car, you fix it.
To make a long story short I reinstalled the old sensor and still got P0130 almost immediately. I wasn't experiencing any of the symptoms that could set this code. I wasn't accepting that 2 sensors would give me the same code.
So, I take my Audi A4 2.0T for a logging of the relevant O2 pids, and did the same on the Passat for comparing.
The only difference between the 2 was that the Passat had no reading for the B!SI resistance PID.
That lead me to search for technical articles pertaining to the Bosch 1375, specifically, the Pico article" Testing the Bosch LSU 4.2 broadband oxygen sensor".
I did all the testing of the sensors & PCM as directed, and didn't find any issues.
In testing the PCM side, and even though my measurements were within specs, I was not satisfied, as the results were inconclusive because the results were that the O2 and the PCM were good.
I then accepted that the O2 was good so, either the wiring, or the PCM are bad. So I proceeded as if the PCM 2,6 to chassis ground/battery positive had a short.
Disconnected the positive cable and did the test and the 2,6 to chassis read 1.6K, 1.7K ohms respectively, and to the positive when connected a dead short to either pin, I didn't expect this because the resistance across 2,6 was 62.2 ohms well within specs.
So my question is where did I go wrong, or just did I just confuse myself?
Re: Bosch 13751
raul.garcia.sr wrote: ↑Sun Apr 12, 2020 6:34 amI have a 2005 vw Passat 1.8T that belongs to my daughter, (but in my name.)
She had a CEL but ignored it until registration renewal came around.
Had a P0174 so she just replace the o2 (Bosch 17351) and headed off to emissions testing, and it failed and she couldn't fix it within the 2 week time limit.
So she handed me the keys and said, it's your car, you fix it.
To make a long story short I reinstalled the old sensor and still got P0130 almost immediately. I wasn't experiencing any of the symptoms that could set this code. I wasn't accepting that 2 sensors would give me the same code.
So, I take my Audi A4 2.0T for a logging of the relevant O2 pids, and did the same on the Passat for comparing.
The only difference between the 2 was that the Passat had no reading for the B!SI resistance PID.
That lead me to search for technical articles pertaining to the Bosch 1375, specifically, the Pico article" Testing the Bosch LSU 4.2 broadband oxygen sensor".
I did all the testing of the sensors & PCM as directed, and didn't find any issues.
In testing the PCM side, and even though my measurements were within specs, I was not satisfied, as the results were inconclusive because the results were that the O2 and the PCM were good.
I then accepted that the O2 was good so, either the wiring, or the PCM are bad. So I proceeded as if the PCM 2,6 to chassis ground/battery positive had a short.
Disconnected the positive cable and did the test and the 2,6 to chassis read 1.6K, 1.7K ohms respectively, and to the positive when connected a dead short to either pin, I didn't expect this because the resistance across 2,6 was 62.2 ohms well within specs.
So my question is where did I go wrong, or just did I just confuse myself?
You can try the following dealer recommendations for oxygen sensor errors.