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p132+ an O2 sensor reading is high bank1,sensor1, p135=O2 Heater circuit is bad, bank1,sensor1.
P300= Random misfires, p301 misfire cylinder1.p302 misfire cylinder2
p420 Bank1 Catalytic converter efficiency failing
What this means is that the Bank1 O2 sensor is either bad or the wiring to it is defective. Check for heat burnthrough on wires. The misfires started randomly and now pinpoint to cylinders 1 and 2.
The Catalytic converter failing because the misfires are clogging it. This can self correct once the cylinders stop misfiring.
Which messed up first is where you start solving this. Replace the O2 sensor, it is fouled out on Bank1. The heater circuit(p135) just makes it work faster and has little effect once you are underway. But high resistence in the O2(p132) means it is coated and ineffective.
There is a problem with firing #1 and #2 sparkplug. Probably the cause for the Catalytic converter plugging. A cracked coil, plug wires, sparkplugs are some causes as well as dirty fuel injectors on those 2 cylinders.
It is a cause and effect situation where 1 part fails and damages another. You need to fix the source of the problem or you will repeat th damage.
All 3 of these Codes have to do with the O2 devices. Some are saying the heating elements are returning low signals. These elements are built inside the O2 sensors and are designed to make your vehicle get out of "rich" mode faster.
Bank2 sensor1, Bank1 sensor1, Bank1 sensor2. Check your connections and the wiring leading to these parts.
You may need to replace these O2 sensors if the wires are good.
your truck should have four o2 sensors bank 1 sensor 1 is o2 sensor on cylinder 1 side before cat and bank1 sensor2 two is 02 sensor after cat banks 2 sensor1 is on other side berfore cat and bank2 sensor2 is after cat hope that helps when they read code it should tell you bank1 sensor1 or2 good luck
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.
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 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.