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Where is Bank 1 sensor 1 located on a 2001 Yukon Denali. I can only find one located on drivers side after cat.( I had the code read it was a po 138 hearter sensor malfun. bank 1 sensor 1) I have been told the sensor is located by the # 1 spark plug. The only thing I see by the plug looks like a water temp. plug going it to the head with some # on the block over it.
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Bank one is the drivers side. If it is bank 1, sensor 1 the it is in front of catalytic converter...if it is bank 1, sensor 2 then it's the sensor behind the converter on the drivers side
Bank 1 is always the same side of the motor as the number one cylinder. Bank two is the other side.
Sensor 1 is always before the cat. Sensor 2 is always after the cat.
Since that year only has one O2 before the cat it would be called bank1 sensor 1. It is located before the cat in the exhaust manifold on the back side of the engine (firewall side).
po 0102 is mas air flow sensor maf/vaf
p0171 bank 1 too lean
p0174b bank 2 too lean
What you have here is either a defective mass air flow sensor and or a possible broken loose or rotted vacuumn line or hose creating this havov, with the engine warm and idling in Park tap the air flow sensor in its housing and see if the engine gets upset(rough) if so replace the sensor its expensive.
If ok have the vac system checked for possible leaks in the hoses at around the intake manifold gasket area etc, fix and replace as needed.
Hi, There are 4 sensors, 2 pre catalytic converter, 2 post. The driver side is bank 1, and the passenger side is bank 2 .The foreward one in the pipe coming from the driver side is bank1 sensor 1, the rear sensor for the driver side is bank 1 sensor 2 . The other side would be the same, but bank 2. Good luck...
if you look at the front of the motor you will notice one cyclinder is further forward then the other... that first cyclinder would be 1. i'm guessing the side opposite to cyclinder one would be bank two.
No, it's either a clogged catalytic converter or, more likely, a bad secondary O2 sensor on the driver's side. The secondary sensor is the one after the catalytic converter, which is used to measure its efficiency. When that sensor fails, the computer can't judge how well the cat is working and often throws a code such as this. However, it should also throw a failed O2 sensor, sensor 2 bank 2, at the same time. You may have a bad cat, but if it comes down to replacing parts, I'd do the sensor first - it's about 15% of the price of a cat.
You could take the two secondary sensors and swap them - move the left side one to the right side and vice versa, clear the code, then scan the car again after running and see if the code comes back the same. If it does, your cat is bad. If it comes back reading a problem on bank 1, it's the sensor.
well on my car these are reffering to the sensors in the exhaust, the upstream sensor(before the cat) and the downstream sensor(after the cat) the downstream sensor can act up if it is lazy or sluggish, or due to a bad catalytic converter or a clogged one. however there are sensors on the exhaust manifold which are determined by driver side or passenger,my opinion is to get a scanner for about $100 to $150 and you can figure out many of these codes yourself.
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