Here is the low-down on oxygen sensors, and their location designations explained:
Oxygen
sensors are screwed into the exhaust system at various points. Some
people say that there are 4 oxygen sensors, but technically, that is not
correct. Only the front 2 are considered oxygen sensors.
These
oxygen sensors are screwed into the exhaust pipe or directly into the
exhaust manifold, one on each bank. Because they are in front of the
catalytic converter, this is often referred to as 'upstream'.
The
other 2 are actually called catalyst monitors. They are oxygen sensors,
but they serve a different purpose. They monitor the activities of the
catalytic converters, thus the name, catalyst monitors. They are screwed
into the exhaust one on each bank, after, or downstream, of the catalytic converters.
On
a 4 cyl engine, there are only a total of two such sensors, the one in
front of the catalytic converter is the O2 sensor, the one behind the
cat is the catalyst monitor.
The location names for them are as follows:
SOURCE: 01 Eclipse GT - bad o2 sensor heater circuit (bank 1 sensor 2)
Your question was truncated. I see that the bad sensor is on bank 1, but I can not see if it is the upstream (sensor 1) or downstream (sensor 2) sensor. The upstream sensors are mounted in the exhaust manifolds (look sort of like spark plugs) and have wires going to them.
You will need a 7/8" or 22mm wrench to remove the sensor (after disconnecting the wires). If your car has over 70,000 miles I STRONGLY suggest that you replace BOTH upstream sensors. One in each exhaust manifold.
Charlie
SOURCE: location of 02 sensor bank 1 sensor 1 on 3 ltr engine
it's right adjacent to the cataytic converter
SOURCE: o2 sensor bank1 sensor 1
usually bank 1 sensor one is closest to the motor(guess) but you can look it up in a manual and just changing the 02 sensor is gonna fix it they are anywhere from 40 to 100 dollars hope it helps
SOURCE: Where is bank1 sensor 1 (O2 sensor) of 2003 Mitsubishi Eclipse
if its a 4 cylinder it will the 02 sensor closest or if not in the exhaust manifold
View & Print Options
View & Print Options
P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)
P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)
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I'm having trouble getting the sensor to break loose. i even cut the wires and tried a deep well socket but it doesn't bite enought.
I bought the O2 sensor 3-piece tool kit at Autozone. got it out in less than 5 minutes. Noting like having the right tool.
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