O2 Sensor problems of the 2005 GMC Envoy

Repeat problems since car was purchased brand new at dealers. Air /O2 sensors defective/replaced. Defective fuel pump/fuel sensor/electronic gas gauge; flickering/dimming headlights; freezing/inability to control driver's side seat and controls. 1/4 of front instrument panel lights out; drivers side seat control lighting 1/4 out; check engine light and low fuel light on continuously since 1997. Tie rods both replaced as well as both front sway bars. Immediately following vehicle purchase, check engine light would continuously go off. I would call onstar at which point I was told to take car in for repair w/I 7-10 days (often told a problem w/powertrain or transmission) . At dealers service dept, told over and over again after tons of worry, concern and time spent, that electrical system on this car tends to trip/trigger check engine light and they would just reset it so after awhile, I began to disregard the light as I was in the dealership almost weekly. Approx 2 yrs after purchase, filled up gas tank and fuel light showed "low fuel". Went back up to full, dropped to 1/2 and back to empty. Went back to full after car was turned off and continued to do this. After about 2 weeks, constantly stays at empty. Called repair shop and was told approx $700-800 to drop tank and replace fuel sensor which I could not afford and began to track odometer and refill tank after 200 miles driven after fill up. Have been doing this for 5 years. Jan 29,2011, I go for emission test. Fail d/t low fuel and check engine light being on. Go to mechanic, approx $950 repair. Check engine light goes off. . . And back on next day. Read thousands of posts online and am finding many, many Envoy owners experiencing same problems as mine. These are safety issues and gm should issue a recall on entire fuel and electrical system. Please call for questions/clarification.

The contact owns a 2005 GMC Envoy. The contact stated that he was experiencing issues with the headlights. When his wife would drive the vehicle at 50 mph, the headlights would get dimmer and dimmer and then brighten again. On one occasion, the lights turned off completely and his wife had to drive home with the hazard lights flashing. The issue occurred intermittently. The contact took the vehicle to the dealer at least four times and they changed the switches and recalibrated the lights. The repairs caused other failures; therefore, they recalibrated to the original lights. The dealer stated that there was no remedy for the failure. The manufacturer stated that they would start a case for him and call him back. The current mileage was approximately 41,000 and failure mileage was approximately 23,000. Updated 11/14/08 the check engine light illuminated. The dealer replaced the O2 sensor. Updated 11/18/08.

- the contact owns a 2003 GMC Envoy. The headlights, dashboard, and tail lights flashed randomly at any speed, this failure started in October of 2006. The weather and time of day were not factors in the failure. The dealership said that the failure was normal. There were tsbs for the failure, as well as for several others. The fuel neck had been replaced twice due to a design change. The seal around the licenses place holder came loose and had to be replaced. The brake pedal was squeaking, the contact took vehicle for service on three occasions, and replaced the serpentine belt twice, an airbag sensor, the rear wiper arm, the oxygen sensor twice ,the first time at 7000 miles. There were cruise control failures, when the contact tried to accelerate it hesitated and then surged. The weather stripping on the rear doors has been repaired three times. The abs would skip on a bumpy road and would not engage. At one point the contact could smell fuel in the passenger compartment and vehicle had very poor gas mileage, the dealer stated that there was nothing wrong with the vehicle, but air valve became stuck and would not close. The rear door hinges squeaked. This winter it won't go to full voltage until a minute elapsed after the vehicle has been started. The original failure mileage was 3829, and the current mileage was 23700. The brakes were inoperative, the belts squeaked, there was a problem with the abs, the air bag light illuminated, the cruise control didn't work properly, the rear wiper would only wipe the middle of the back windshield. A new fuel neck was installed. Updated 03/15/07.