Catalytic converters diagnostic code on check engine light says problem in bank 1 of catalytic system My 96 toyota camry 2.2 l, 4 cylinder has 2 converters. front and back. y car has 260,000 miles on it. Do I need to replace both converters or just front or just rear? Thanks, Mike

Bank 1 is always the same side as the number one cylinder. Bank 2 is the other side of the engine. Sensor 1 is always before the catalytic converter and Sensor 2 is always after the catalytic converter.

bank 1 refers to the side of the engine. on a four cylinder there will onlyu be a bank one. a v-6 will have a bank 1 and a bank 2. Bank 1 will be on the same side of the engine as cylinder number one. Bank 2 will be the opposite side. Sensor 1 is always before the catalytic converter. Sensor 2 is always after the catalytic converter.

So , for example, if your looking for Bank1 Sensor2 it will be in the exhaust pipe after the cat on the same side as the number one cylinder.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The air/fuel ratio sensor has gone bad (basically the O2 sensor). The code P1130 is Bank 1 Sensor 1.
Sensor 1 is before the catalytic converter coming off the exhaust manifold. Bank 1 is which ever side cylinder 1 is on your engine. In this case its a sideways engine and its closest to the firewall.

The code 1055 is brand specific, and for Toyota it means there is a problem with the heater circuit for the O2 sensor bank 2 sensor 1. That is the sensor in front of the catalytic converter or split and on the side with cylinder number 2 which may be the passenger side.
The sensor could have failed, or it could be a problem with the power source for the heater inside the sensor.

v-6 has two O2 sensors, one located in the exhaust manifold and the other near the catalytic converter

did you replace the oxygen sensor?

CODE P0421. DEFINITION-CATALYST EFFICIENCY LOW-BANK 1. EXPLANATION-THE OXYGEN SENSORS MONITOR THE CATALYTIC CONVERTERS ABILITY TO STORE OXYGEN. PROBLEM CAUSES- 1. CATALYTIC CONVERTER DEFECTIVE (FAILURE POSSIBLY DUE TO #2,3, OR 4) 2. ENGINE MISFIRE OR RUNNING CONDITION. 3. LARGE VACCUM LEAK 4. ENGINE OIL LEAKAGE INTO EXHAUST-VALVE GUIDE SEALS, PISTON RINGS. THE PCM HAS DETERMINED THAT THE WARM UP CATALYST EFFICIENCY FOR BANK 1 IS BELOW TRESHOLD FOR THE CURRENT ENGINE OPERATING CONDITION. (BANK 1 IDENTIFIES THE LOCATION OF CYLINDER #1, WHILE BANK 2 IDENTIFIES THE CYLINDERS ON THE OPPOSITE BANK).

replace O2 sensors, or your Catalytic Converter.

Bank 1 is the same side that cylinder 1 is on which should be passenger side. Sensor 1 is right in front of the catalytic converter,and sensor 2 is after the converter.

have the engine light code scanned, and it'll tell you if it's bank 1 sensor 1, bank 1 sensor 2, bank 2 sensor 1, bank 2 sensor 4.

Bank 1 is on the same side as Cylinder 1
Bank 2 is on the opposite side of Cylinder 1

Sensor 1 is located before the catalytic converter.
Sensor 2 is located after the catalytic converter

As long as the area you live in doesn't require emission testing, you don' need to fix it. It won't hurt anything. But you will have to stare at the light or put tape over it.