Some background info... The truck in question is my '97 K1500 5.7L Suburban. Factory exhaust, factory O2 sensors. Aftermarket Crimestopper remote start/keyless entry system which has been installed and relatively problem free for over 10 years.
For about a year now I've noticed that it will occasionally throw a SES light for a P0141, which signifies poor O2 sensor heater performance on bank 1 sensor 2. This only happens when I use the aftermarket remote start system a few times in a row. I thought that it might be a voltage drop issue (voltage is always lower than normal when started with the remote until the key is in the ignition) so I recently cleaned up my battery terminals and cables. That eliminated some voltage drop but unfortunately the P0141 popped up again tonight.
I recently purchased a clone Tech 2 scan tool so I connected that and noticed that there were also a couple of stored P0161 faults, which is the same deal but for bank 2 sensor 2. The P0161 doesn't pop up often enough to trigger a SES light like the P0141 does, but I can see it regardless with the Tech 2.
I already have one brand new spare OEM post-cat O2 sensor on my parts pile, so my instinct is to order another and replace them both. I suspect that the heating elements in both of them are just getting tired after all these years. I'm curious to hear if anyone else has any thoughts on this though, anything I'm missing or should check out?
For about a year now I've noticed that it will occasionally throw a SES light for a P0141, which signifies poor O2 sensor heater performance on bank 1 sensor 2. This only happens when I use the aftermarket remote start system a few times in a row. I thought that it might be a voltage drop issue (voltage is always lower than normal when started with the remote until the key is in the ignition) so I recently cleaned up my battery terminals and cables. That eliminated some voltage drop but unfortunately the P0141 popped up again tonight.
I recently purchased a clone Tech 2 scan tool so I connected that and noticed that there were also a couple of stored P0161 faults, which is the same deal but for bank 2 sensor 2. The P0161 doesn't pop up often enough to trigger a SES light like the P0141 does, but I can see it regardless with the Tech 2.
I already have one brand new spare OEM post-cat O2 sensor on my parts pile, so my instinct is to order another and replace them both. I suspect that the heating elements in both of them are just getting tired after all these years. I'm curious to hear if anyone else has any thoughts on this though, anything I'm missing or should check out?