Had a bad O2 sensor on my mk4 that was going out intermittently. During this time, I noticed that the computer handled the fuel/air ratio differently when the check engine light was on vs when it wasn't, at least for O2 sensor related codes. When the light is on, the computer doesn't trust the reading at all and floods the engine with as much fuel as possible. (Better to run rich than lean in a pinch, I suppose.) When it's off, it would actually attempt to maintain an ideal ratio. My intermittent behavior was temperature dependent, so on warm days I was clearing the code to get better performance. Whereas on colder days, I'd need to leave the code running or risk the car dying of fuel starvation. All that's to say that you probably triggered a similar code when the battery was low on charge. Run a quick OBD2 scan, and if I'm right about it being an O2 sensor code, just blindly clear it and see if your performance is back. Also, don't feel too bad about snapping the tab. I swear that happens to me every damn time. The plastic just dried out too much over the last couple decades for them tabs. (I'm lazier than you though and just leave them broken lol)
@@VanessaGorman dude I have broken so many tabs on this car. The junkyard has become my friend. I'm going to scan it today and see if you're right. I hope you are because the car was running fine before the battery died. Thanks for the tip man. I really appreciate it.
@@VanessaGorman welp. I think the low battery condition triggered the check engine light. It was a code for idle adaptation limit. I cleared it and I've driven it over 200 mi and it's all good.
Had a bad O2 sensor on my mk4 that was going out intermittently. During this time, I noticed that the computer handled the fuel/air ratio differently when the check engine light was on vs when it wasn't, at least for O2 sensor related codes.
When the light is on, the computer doesn't trust the reading at all and floods the engine with as much fuel as possible. (Better to run rich than lean in a pinch, I suppose.) When it's off, it would actually attempt to maintain an ideal ratio. My intermittent behavior was temperature dependent, so on warm days I was clearing the code to get better performance. Whereas on colder days, I'd need to leave the code running or risk the car dying of fuel starvation.
All that's to say that you probably triggered a similar code when the battery was low on charge. Run a quick OBD2 scan, and if I'm right about it being an O2 sensor code, just blindly clear it and see if your performance is back. Also, don't feel too bad about snapping the tab. I swear that happens to me every damn time. The plastic just dried out too much over the last couple decades for them tabs. (I'm lazier than you though and just leave them broken lol)
@@VanessaGorman dude I have broken so many tabs on this car. The junkyard has become my friend. I'm going to scan it today and see if you're right. I hope you are because the car was running fine before the battery died. Thanks for the tip man. I really appreciate it.
@@VanessaGorman welp. I think the low battery condition triggered the check engine light. It was a code for idle adaptation limit. I cleared it and I've driven it over 200 mi and it's all good.
@@MaqsVids Hell yeah! I had a feeling it was something like that.
When the feed me light comes on in my TDI beetle i have 50 miles to go.
50!!??? 😲🤔 I wish I got that kind of mpg
@MaqsVids love my diesel!