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My Check Eng light is on with a bank 1 Catalytic converter code on my Mazda 6 3.0 eng I understand there are 4 cats on my car I was wondering what one needs replaced Mike
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Four. There are two located before the catalytic converters and two after the catalytic converters.
The are referred to as bank 1 and bank 2 and sensor 1 or sensor two. Bank 1 is always the same side of the engine as the number one cylinder. Bank 2 is the other side. Sensor 1 is always before the catalytic converter. Sensor 2 is after the catalytic converter.
Bank 1 sensor 1 - same side of the engine as the number one cylinder and before the cat.
Bank 1 sensor 2 - same side of the engine as number 1 cylinder, after the cat.
Bank 2 sensor 1 - Opposite side of the engine as the number one cylinder and before the cat.
Bank 2 sensor 2 - Opposite side of the engine from number 1 cylinder and after the cat.
The answer depends on the type of exhaust system you have. You will have either 3 or 4 total O2 sensors on your V8. If you have single exhaust with a single catalytic converter then you will have 3 O2 sensors (2 upstream sensors & one downstream sensor - "up or down stream" meaning before of after the catalytic converter). If you have either dual exhaust and/or two catalytic converters then you have 4 O2 sensors (2 upstream & 2 downstream). If you have an MIL light (malfunction indicator light, or "check engine light") the code will indicate "front bank / bank one", which is one of the 2 upstream O2's before the catalytic converter(s), or "rear bank / bank two", which is one of the O2's after the catalytic converter(s).
Bank 2 is the bank that is farther back than the other when looking at eng from the front you will see that one cyl head is farther forward (closer to radiator than the other. this is #1 Bank) #2 is the opposite and sensor #2 is the one after the Catyliac Convertor towards the muffler. #1 sensor is between head and Cat.
(8th digit of the VIN code is the Engine) H eng.code a 2.3L 4 cyl. Hybird/ Z eng. code a 2.3L 4 cyl. / and a 1 eng.code a 3.0L 6 cyl. Couldn't say if one was a Mazda engine. Usually if you have a Mazda part on a Ford it's the Transmission.
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).
tis telling u about Oxygen sensor..bank 1 n 2 means exhaust manifold ( u have on each manifold before and after the catalytic converter.. ( ti's for 6 cyl.. very common on ford eng..(windstar..have 2 catalyctic.. O sensors is about $50 a pc..
More often than not the Cat is bad. Replacing the sensors is the easiest move. Reasons for the cat to go bad will be related to something else wrong with the fuel management and emissions systems in the car, improper sealants or chemicals used on prior repairs causing damage to the cat
P0032
means HO2S Heater Control Circuit High (Bank 1 Sensor 1).
It means high impedance from O2 sensor, check wiring to sensor and replace the sensor. Check O2 sensor located in bank 1 (cylinder 1 side- see here), and after the catalitic converter (there is also an O2 sensor before cat converter).
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