Repair 7

There are two oxygen or O2 sensors in the exhaust system on the 1995 Chevy Astro van. The process of changing the O2 sensors is the same whether it is the upstream or downstream sensors that you need to change, except that the location is different. These O2 sensors are critical to the proper operation of the fuel system and performance of the engine in your van. If you have a bad sensor, change it right away to correct drivability issues, hard stats and poor fuel mileage.

Instructions

1

Raise the front of your Chevy Astro with a jack and support it under the frame rails with a set of jack stands. Remove the jack once the van is securely on the stands.

2

Locate the O2 sensors from under the van. The upstream sensor threads into the exhaust pipe coming down from the engine manifold. It is on the inside edge of the pipe, closest to the engine block. The downstream O2 sensor is in the exhaust system just forward of the catalytic converter.

3

Determine which sensor you need to change, and position yourself below it. Locate the wiring harness coming out of the back of the top of the sensor and follow it up to the connector where the sensors harness and the vans wiring harness join. Disconnect the two halves of the connector by releasing the locking tab and pulling them apart.

4

Remove the O2 sensor from the exhaust pipe using an O2 sensor socket and ratchet to turn the sensor counterclockwise until it is free from the threads. Discard the old sensor and install the new one into the threaded hole on the exhaust pipe using your hands to get it starter. This will help prevent cross threading.

5

Tighten the O2 sensor with your O2 sensor socket and ratchet. Run the wiring harness connector from the new sensor up to the connector on the vans wiring harness. Push the two halves of the connectors together until the locking tab engages. If you are replacing both sensors, move to the other sensor and repeat the process.

6

Raise the front of your Astro off the jack stands with a jack. Remove the stands from under the van then lower the jack, setting the van back on the ground. Test run the engine to verify the sensors are functioning properly.

The 1997 Mazda Protg has a single oxygen sensor threaded into the exhaust manifold. When the sensor fails, it will trigger the "Check Engine" light on your cars instrument panel, and your cars gas mileage will substantially decrease. If you want to avoid losing money at the gas pump, purchase a new sensor from an auto parts store and replace it at home.

Instructions

1

Raise the Protg with a jack and secure the car on jack stands. Locate the oxygen sensor threaded into the exhaust manifold. The exhaust manifold is located beneath the intake at the base of the engine and is connected to the exhaust pipe. The oxygen sensor resembles a spark plug threaded into the manifold with an electrical wire connected to the top.

2

Pull the electrical connection apart to disconnect the wiring harness from the sensor. Remove the oxygen sensor from the manifold with a wrench.

3

Coat the new sensor threads with anti-seize compound. Insert the new sensor by hand. Tighten the sensor with the wrench. Push the electrical connection together until it locks.

4

Raise the car slightly with the jack. Remove the jack stands and lower the jack to return the car to the ground.

Fords 2002 Rangers come equipped with an instrument cluster that displays operational information gauges such as vehicle speed, engine rpm and transmission gear selection, as well as critical performance information gauges such as fuel status, engine coolant temperature, oil pressure and battery charge state. Additional information is indicated on the Rangers instrument cluster by warning lights that illuminate as needed. The gauges are backlit for visibility during low light situations by a series of small light bulbs. Replace burned out bulbs to maintain instrument visibility.

Instructions

Removal

1

Remove the negative battery cable from the battery using a wrench.

2

Remove the two center instrument panel screws from below the radio. Pull the center instrument panel from the console. Disconnect the electrical connectors and unplug the radio antennae lead from the radio. Set the center instrument panel aside.

3

Lift up on the hood release lever and remove the two bolts. Set the hood release lever aside.

4

Remove the two screws from the bottom of the steering column panel below the steering column. Remove the panel.

5

Remove the two steering column cover reinforcement bracket screws. Set the bracket aside.

6

Remove the three upper and two lower instrument cluster finish panel screws. Pull the finish panel away from the instrument cluster, unplug the electrical connectors and set the finish panel aside.

7

Remove the four instrument cluster screws. Pull the instrument cluster out slightly. Unplug the two electrical connectors and pull the automatic transmission indicator out of the instrument cluster, if applicable. Remove the instrument cluster.

8

Locate the socket of a burned-out bulb. Rotate the bulb socket counterclockwise and pull it out of the cluster. Remove the bad bulb from the socket.

Installation

9

Insert the new bulb into the socket. Insert the socket into the instrument panel and rotate clockwise to lock it in position.

10

Install the automatic transmission indicator and reconnect the electrical connectors to the instrument cluster. Insert the instrument cluster in the dash and install the four instrument cluster screws using a nut-driver.

11

Connect the electrical connectors to the instrument cluster finish panel. Place the finish panel in position and install the five screws. Tighten the finish panel screws to 18 to 26 inch-pounds.

12

Install the steering column cover reinforcement bracket and screws. Tighten the bracket screws to 89 to 124 inch-pounds.

13

Install the steering column panel and screws. Tighten the panel screws to 18 to 26 inch-pounds.

14

Install the hood release lever and bolts. Tighten the bolts to 25 to 33 inch-pounds.

15

Connect the center instrument panel electrical connectors and the radio antennae lead. Insert the center instrument console into the dash. Install the two center instrument panel screws. Tighten the screws to 18 to 26 inch-pounds.

16

Install the negative battery cable on the battery and tighten to 62 to 89 inch-pounds.