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2002 Suzuki XL7 2.7 V6 4wd. Code reader says bank 1 sensor 1 o2 sensor us bad. This vehicle appears to have 4. Which side is bank 1 and which is sensor 1.
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Bank one sensor one is on the side with cylinder one and before the catalytic converter. Please be aware the code is for the heater circuit which may mean the sensor is bad, or the sensor may be ok and the problem is in the heater circuit.
Which one? Your vehicle is equipped with 2. One is in the exhaust manifold on the left bank and the other is in the exhaust pipe after the catalytic converter.
NOTE: Most O2 sensor codes do not mean that the O2 sensor should be replaced. Most of the time, the O2 sensor is only reporting the failure of one of the other system components. To save time and money, I personally recommend having the vehicle diagnosed by a qualified service technician. I have seen many people spend hundreds of dollars on O2 sensors only to find out that the problem was caused by something else. Case in point: One man spent nearly $500 replacing all 4 of the O2 sensors on his Ford F-150 Pickup only to have the O2 Sensor code return 2 days later. He brought the vehicle to me and I fixed it with 50 Cents worth of vacuum tubing. O2 sensors do fail, but about 70% of all the O2 sensors that get replaced do not fix the problem that caused the O2 Sensor fault code. Fault codes Never tell you what parts to replace. They only tell you which of the many parameters monitored by the computer is out of specification. Proper diagnosis is required to find out why.
In that particular engine the sensor that you have is the one in the driver side, but based in my experience you have to replace both, the same in tundras, the computer sees a fresh new, fast signal, from the new sensor and thinks that the sensor and the opposite bank fail.
Bank 1 sensors are all the o2 sensors before the converter. Bank 2 sensors are all after the converter.On bank 1 there is 1 for each side of the exhaust manifolds. Bank 1 sensor 1 is on the side ot the engine that #1 cylinder is on. Bank 1 sensor 2 is on the other side. On front wheel drive GM vehicles sensor 1 is in front,2 is in back, but stiil in front of catalytic converter.
Your car is equipped with a diagnostic system called OBD II. You can purchase a code reader and use it to find which O2 sensor is causing the problem. You probably have 4 sensors. 2 in front of the converter and 2 behind. The code reader will indicate something like "SEN 1 BANK 1." This means O2 sensor in front of the cat. on the side of the engine that contains cylinder 1. You may see "SEN 2 BANK 1" "SEN 1 BANCK 2" "SEN 2 BANK 2" Bank 2 indicates oppisite side of No.1 cylinder. Hope this helps
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