I am curious as to whether others on the forum have had compatibility issues with GM vehicles and Bosch replacement electronic parts. 5 years ago, I owned a 1998 Malibu LS with a 3.1L engine. When it came time to replace the original spark plugs at 240k kms, I decided to use Bosch Platinum plugs and a new set of plug wires (not sure of brand). Shortly after replacing the plugs, the car began misfiring randomly on all 6 cylinders. I own an OBD-II code scanner, which I was able to use to verify which plug/coil was misfiring, and began replacing what I thought were faulty coil packs with new coils, which made no difference. After a few weeks of coil swapping and numerous other attempts to stop the misfiring, it occurred to me that this all began with the servicing of the plugs. So I went out and bought 6 new AC Delco OEM replacement plugs, installed them, and never had another issue until I sold the car a year later.
Skip to present day. I now own a 2001 Monte Carlo LS, 3.4L engine, with 285k kms. I’ve owned the car 4 years with very little issues, aside from regular maintenance items. Just recently, I had to replace the upstream O2 sensor, due to the heating element not working anymore. I picked up a replacement part, which was a Bosch part, and while replacing the original sensor, checked the wiring harness for chafes and breaks, which I could not find. I did not, however test the voltage with a voltmeter because of the good condition of the wires and connector. The new sensor worked ok for about a month, until this week when I noticed my MPG decreasing and eventually, the CEL illuminating. When I plugged in my scanner, it brought up a P0134, “O2 sensor circuit, no activity detected, bank 1 sensor 1”, which tells me the replacement Bosch sensor I installed is either a) defective, or b) once again, refusing to cooperate in my non-German, American GM built car. I have already arranged to bring this sensor back under warranty and replace it with another brand, and pay the difference in price. I will also test the connector for proper voltage readings, which I am not expecting to find issues with.
Is it just me, or have others encountered these types of problems with Bosch products and their GM, or other NA built cars? I have used Bosch parts on other, older cars in the past and up until owning these two GM cars, have not had problems with them. Any input on this is greatly appreciated.