Stubborn TPMS Warning Persists Despite Reset & Good Air

Had a similar issue with my 2003 Buick LeSabre. The tire pressure monitoring system (TPMS) warning stayed on despite proper air pressure in all tires. After checking each tire and confirming the air valve was secure, the problem turned out to be a faulty TPMS sensor battery. TPMS sensors typically last 5-10 years before their batteries die. When this happens, the system cant read tire pressure properly, triggering constant warnings. Its a common issue in older vehicles, not a serious mechanical problem. The fix required replacing all four TPMS sensors since they were all near end of life. The repair took about an hour at the shop. If you only replace one sensor, you might face the same issue with another sensor soon after. Worth noting that driving with a failed TPMS sensor wont damage your car, but you will need to manually check your tire pressure regularly until its fixed. Low tire pressure can affect fuel economy and tire wear, so keeping an eye on it is important. Make sure the shop uses OEM-spec sensors compatible with your Rendezvous. Aftermarket sensors sometimes cause compatibility issues with the cars computer system.

Thanks for the detailed response about the TPMS issue. I ended up having exactly the same problem with my 2006 Rendezvous last winter. The tire pressure was perfect when checked with a pressure gauge, but that warning light just would not quit. I went ahead and replaced all sensors too, figured it made sense since they were original to the car. How much did your sensor replacement cost? Mine came to about €380 total including labor, wondering if that was reasonable. Also curious, have you had any TPMS errors pop up since the repair? My warning light has stayed off for months now, but sometimes I worry it might come back since these older Buicks can be quirky with their sensors.

After getting my LeSabre fixed at the mechanic, the tire pressure sensor fault cleared up completely. The total bill came to 280 for replacing all sensors, which sounds like a better deal than what you paid. But shop rates vary quite a bit, and parts costs fluctuate too. The good news is I havent seen a single TPMS error message since the repair was done. The system has been working perfectly for monitoring tire pressure. Regular tire checks with a pressure gauge show the sensor readings match up exactly with actual pressures now. These older Buicks are indeed known for sensor issues, but once the faulty sensors are replaced with quality parts, the fix tends to be long-lasting. The key is making sure they use proper sensors compatible with the vehicle computer system. Since the repair, my TPMS has been reliably alerting me if any tire needs air, which gives good peace of mind. New sensors should last another 5-10 years before their batteries die again. Having them all replaced at once was definitely the right call to avoid dealing with multiple sensor failures over time.

Wanted to close the loop on my TPMS sensor situation. Finally took my Rendezvous to a different shop. The mechanic found old corroded sensors, just like mentioned. Cost me €380 total for all new sensors and labor, which seemed fair considering the work involved. The repair process was pretty straightforward, took about 90 minutes while I waited. Mechanic showed me the old sensors and explained how the batteries had died after years of use. The new ones are working great now, no more annoying tire pressure light or sensor errors. Best part is the TPMS system finally shows accurate readings for all tires. Much better than manually checking pressure every week like I was doing before. Definitely worth getting it fixed properly instead of ignoring those warning lights. Thanks again for the advice about replacing all sensors at once. Saved me from potential headaches of having to go back multiple times for the same issue.