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The 1995 Pontiac Bonneville SSEI engine has one oxygen sensor that detects the oxygen saturation in the exhaust and relays the information to the engines computer to regulate the fuel consumption. When a sensor fails, the "Check Engine" or "Service Engine Soon" light may illuminate on your dash. If the light is on and your fuel mileage has significantly decreased, replace the sensor as soon as possible to save needless expense.

Instructions

1

Raise the hood of the Bonneville. Locate the oxygen sensor threaded into the exhaust manifold near the front of the engine compartment.

2

Pull the electrical connection apart to disconnect it from the sensor. Remove the sensor with a wrench.

3

Coat the threads of the new sensor with electrical anti-seize compound. Install it by hand to avoid cross-threading. Torque the sensor to 30 foot-pounds with a torque wrench.

4

Push the electrical connector together until it clicks. Lower the hood.

On February 16, 2004, General Motors informed the National Highway Traffic Safety Administration that it would be recalling certain 2000 Bonneville Pontiacs for an issue causing drivers to experience backfires if the engine was not starting when cranked. Owners of this model experiencing starting problems should contact NHTSA to determine whether their vehicles were affected by this recall.

Cause

2000 Bonnevilles equipped with 3800 V6 L36 engines and certain Delphi Fuel pressure regulators may experience a high level of fuel leaks that can let fuel into the intake manifold. The manufacturer reports that if the engine doesnt start when cranked, the car may backfire from the regulator fuel leak.

Consequence

If the Bonneville backfires, the intake manifold may rupture. A rupture could cause the fuel line and fuel injector to displace, leading to a fuel lead or fire that could cause injury or property damage.

Solution

Take affected vehicles to authorized dealers to have a new fuel pressure regulator installed. Call NHTSA or the manufacturer with the VIN number of the vehicle to verify that it was recalled, if necessary, or to find out where to take the car for free repair.