Oxygen sensors

[suzuki pro]

P0171- fuel system too lean/rich bank 1
P0174- fuel system too lean/rich bank 2

[krickett]

Can anyone tell me what that means?

[suzuki pro]

you're either running too rich or lean. first you need to find out which one. when you get the codes scanned, ask for freeze frame data & look at fuel trim, if its positive, you're running lean & ecm is adding fuel. neg is opposite. then you'll look at things like fuel pressure (had the pressure regulator recall done?) vacuum leaks, maf sensor etc etc..
how does it run? a misfire will cause a false lean reading..but that would likely be isolated to one bank.
try to get all the freeze frame data. vss, rpm, maf, pulse width, etc

[centerforce75]

1.Ok, when you pop your hood, remove the top plastic shroud or cover that is on the top of the engine like you would to change your spark plugs.

2. look at the backside of your engine and if you look close enough, you will see two sets of exhaust pipes that join into a V shape. Your engine is classified in 2 banks. Bank 1 is everything associated with cylinders 1,2 and 3. Bank 2 is associated with cylinders 4,5 and 6. Bank 1 has three pipes covered with a heat shield going from the top end of the engine down under the car. From the passenger side, you will see bank 1. From the drivers side, you will see bank 2 and you will see where both banks begin to join together to lead under the car.

3. You're gonna have to stick your head down in there but on each side, you will see two plugs. They are directly between the back of the engine and the firewall. One will be about 8 inches above the other on each side. The top one is your primary or upstream. The bottom one will be your secondary or downstream. Each plug has a grey insulation cover over it. Each plug is kinda brass colored and will protrude about 2 inches from the exhaust and have a small collar around it.

4. Spend the time and 10 dollars and go to your parts store and get an O2 sensor socket. If you dont, you will spend several hours trying to get the sensors in and out versus 2 or 3 minutes. The socket will be heavy duty metal and have a slit cut out in the side of it to get it in and out without cutting wires. If you have trouble getting them out, use a bit of penitrating oil then try again.

5. Once you get them out, make certain that your new ones have "Anti-Seize" on the threads and put them in. Once they are all in and connected, double check your vaccum tubes. There are several back there that are easily bumped and unplugged. If you dont re-connect them, your car will run like crap.

The universal sensors are good. Bosche makes them and they cost about 70 bucks each. You will have to attatche the old connector to the new wires. It takes a little time but its easy.

Make sure you do this with a cool engine. Makes life a little more pleasant.

Have fun!!!