Picture of bank1 sensor1 o2 sensor location on 2001 chrysler town & country

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O2 Oxygen Sensor Replace on 2001 Town and Country
O2 Oxygen Sensor Replace on 2001 Town and Country

change oxgen sensor,left side of eng in exhaust header(eng bank1,first sensor,your van has at least 4 o2 sensors

if your asking where is sensor 1 bank 1 its in the exhaust pipe coming off the firewall side(rear) of the engine, sensor 1 bank 2 is in the exhaust pipe coming off the rad side(front) of the engine. they are the first sensor that you come to.

Hopefully this picture will help you.. Best of Luck..

Hi the p1684 means the battery has been disconnected within the last 50 starts, the P0135 is Oxygen O2 Sensor Heater Circuit Malfunction (Bank1, Sensor1), you may have notived an increase in fuel consumption. and the P0456 code means evaporated emissions system -small leak detected the causes could be either A small leak in any of the EVAP hoses or fuel tank hoses, a small leak in the purge valve or vent valve or the EVAP Canister may be leaking
Hope this helps
Steve

Some of your O2 sensors are before the catalytic converter and some are after, based on your description. I've seen some cars that had to have all of the O2 sensors replaced when the exhaust system was replaced.

O2 sensors need a special socket to remove, and are best done when the exhaust is hot, and, also, antiseize compound should be used on the threads with the new O2 sensors.

Be prepared to have an exhaust technician change them out for you in order to get it passed the eCheck.

Good luck on this repair.

Locate the faulty oxygen sensor in the exhaust system, disconnect the electrical connection, and then you will either need the correct size box wrench or oxygen sensor socket(available at most part stores) to remove the sensor. I recommend either warming up the exhaust system a bit and being careful not to get burned or using liquid wrench to help loosen it up. Installation is the reverse. Just make sure you remove the correct sensor, these new vehicles often use more than one oxygen sensor.(bank1 is driver's side, bank2 is passenger's side, sensor1 is before the catalytic converter, and sensor2 is after the catalytic converter)

This is a 4 cylinder right? Open the hood and look down between the engine and firewall, this is behind the engine. You will see the exhaust pipe, follow the exhaust pipe up to where it is bolted to the exhaust manifold. You will see the upstream O2 sensor screwed in there, more or less horizontally with wire connector pointed at driver side of car. Now get under the car and find the catalytic converter in the exhaust pipe, a big bulbous thing, the downstream O2 sensor will be after the converter, but before the muffler and will also have an electrical connection.

the first one on the right hand side before the catalytic converter

the O2 sensor for bank one sensor one is located between the catalytic converter and the engine in the exhaust head pipe. see photo of your engine cylinder layout, the sensor u want to replace is the one at the cylinder #1 bank on right.