Upstream oxygen senser

What was the code? did it end with a 1, that is downstream. Or 4, that is upstream

1 Warm up the engine for about four minutes to bring it to operating temperature. Then turn off the engine. This will avoid damage to the exhaust pipe threads if that sensor has seized to the pipe.

2 Find the oxygen sensor or sensors you need to replace. The upstream sensor is located near the exhaust manifold and the downstream sensor on the back exhaust pipe, close to the catalytic converter.

3 Disconnect the oxygen sensor electrical connector. Depending on your particular Chevy model, both sensors may be disconnected from the engine compartment.

4 Lift the front of your Chevy model to reach the sensor you need to change, if necessary. Use a floor jack and two jack stands to support it.

5 Remove the oxygen sensor using a box-end wrench or a ratchet and oxygen-sensor socket.

Read more : http://www.ehow.com/how_5159092_replace-oxygen-sensor-chevy.html

This car had 3 different engine options, but I only show one sensor upstream from the catalytic converter.
Before you replace it know that something else can make that code set. The computer does not like the reading from the sensor.

Hello! The defective ignition coil more than likely contaminated the downstream O2 sensor...If there isn't a trouble code and engine performs in a normal fashion, there's no reason to change the upstream sensor...

Guru........Saailer



I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

there should be 4 2 upstream and 2 down stream

UPSTREAM OXYGEN SENSOR
The oxygen sensor is installed in the exhaust manifold Upstream Heated Oxygen Sensor - 2.4L. or Upstream Heated Oxygen Sensor - 3.0L. or Upstream Heated Oxygen Sensor - 3.3/3.8L .

CAUTION: Do not pull on the oxygen sensor wire when unplugging the electrical connector.

WARNING: THE EXHAUST MANIFOLD AND CATALYTIC CONVERTER MAY BE EXTREMELY HOT. USE CARE WHEN SERVICING THE OXYGEN SENSOR.

REMOVAL
Raise and support vehicle.
Unplug oxygen sensor electrical connector.
Use a socket such as Snap-On YA8875 or equivalent to remove sensor.
When the sensor is removed, the exhaust manifold threads must be cleaned with an 18 mm X 1.5 + 6E tap. If using original sensor, coat the threads with Loctite 771-64 anti-seize compound or equivalent.
INSTALLATION
Reverse removal procedure to install a new sensor
New sensors are packaged with compound on the threads and no additional compound is required. The sensor must be tightened to 27 N·m (20 ft. lbs.) torque

The oxygen sensor are just refered to as upstream for the o2s and down stream are actually refered to as catalytic monitors. So if you have lean or rich codes these would refer to the upstream .

bank 2 sensor 1 is oxygen sensor upstream before catalytic converter.

Changing the O2 sensor for a P-0135? Use a TOYOTA sensor. The aftermarket/generic sensors do NOT work in Toyotas.

User with the smoking problem: Remove the valve cover & check for engine oil sludge where the cams ride. If it is sludged, a rebuild is necessary, BUT, Toyota DOES have warranty assistance for this issue. All you need are oil change receipts.

this fords have very comun problems with maf sensors geting contaminated, if you have not or can hear any vacium leaks, the problem is goin to be a conataminated mas air flow snsor (maf)
allow the engine to cold down for at least 15minutes and the remove the air filter hosing and inside has to have a sensor, clean the two liitle resistors inside with brake or carburetor cleaner, allow it to dry and reinstall it.
if this inf help please mark it as fixya ranking after you try what i said