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| Murphy’s Law with my OBD2 reader |
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| Pfriemler:
I use several OBD2 diagnostics for my vehicles and can confirm, that the engine lamp stop to lit after a temporair failure does not reappear. Mostly it's about three engine cyclings (off/on). This is intended and normal, i.e. the failure may be gone long before the lamp stops. Whereas P1xxx codes are manufacturer specific, the P0xxx have to be identical. P0314 are ignition failure, unburned fuel may harm the cat. In my BMW E9x diesel I have two failures in storage without any harm to the machine, my mechanics advised me to leave as is. I may reset them, they reappear. As they are not critical to emission values, the engine lamp remains dark. Emission tests were passed always. Fun fact: my 2wheel BEV has OBD, too. A few days ago the lamp came only for one cycle, I managed to read the code, a P1xxx, varying from 02 sensor to motor coolant temperature failures - it was the battery management system reporting that is was to cool to charge the battery... |
| edy:
So it turns out my battery finally died today. It failed to crank the engine on. I had to run to work so I used my wife’s car and when I came back home I took the battery out and used a car battery charger to top it up. I managed to get it back into the vehicle and it started the engine. Only warning light that continues to be on as it was before is the Service B1 (oil change, oil filter, etc) maintenance code. Engine check MIL light still off. I did notice some difficulty cranking especially when it was colder a few weeks ago. I thought that if the temperature got warmer (as it is now in Toronto) that it resolve itself. I am pretty sure I didn’t leave any lights on and nothing was draining the battery. By the way it’s probably a number of years old… I’m sure more than 5 years now. I’m any case, I’m wondering if the fact that the battery was a bit low could have erroneously triggered that code about the cam sync sensor. Or… it could be there is a slow discharge of the battery through some corroded wire short that is draining the battery and could cause issues with the sensors. I’m going to get my mechanic to do the Service B1 anyways and switch out my battery (unless he thinks it can be reconditioned but it is fairly old) and see if there is anything else he can find. |
| mendip_discovery:
I have found a few time when the battery is weak that you can get a host of random errors from the car. Some of the computers are rather sensitive to low power exp when cranking to start. I have the issue of water getting into stuff which makes the computer not shut down so it keeps waking up and draining the battery over the week. |
| tom66:
Definitely a thing. I had an intermittent 12V system problem with my hybrid Golf, due to a high-resistance fuse. The fuse failed in such a way that the 12V from the battery would be unstable. (In VW's infinite wisdom, the 12V battery is in the boot, and the 200A cable with fuse hangs off the positive terminal. It's basically a spring, so any bumps at the back cause the fuse to experience additional stress.) I pulled about 120 errors from the VCDS port before the fuse was replaced, everything from "infotainment system CD player fault" to "ABS controller malfunction". |
| edy:
So after charging up the battery last night and starting the car, this morning I woke up to a dead battery. I charged it up again just enough to start the car and then noticed the light at the back (for the hatchback trunk on a CR-V) was set to permanently “on”!!! |O So that’s probably what drained the battery overnight. I don’t know how long it has been that way. Anyways I managed to drive to work and brought all my charging gear. I didn’t disconnect the battery so we will see if there is still a drain somewhere or if I found the culprit. |
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