Jetdriver

Just got a check engine light and the code is a p1133. What does that mean and what do I need to do to fix it??

Thanks again
Shawn

JAY4SPEED

That code is for an oxygen sensor insufficient switching problem. Could be the heater in the O2 sensor went out or a sensor going bad. 8 out of the 10 we see, replacing the sensor usually fixes it. There are other things that could cause this like exhaust leaks, vaccum leaks, coolant leaking into the exhaust stream somehow...etc. But I'd try replacing the sensor first, bad sensor is usually the case. This particular code is for bank 1 sensor 1. This means bank 1 is the same bank as cylinder number 1. On Chevys its the driver side (you have a truck if i remember correctly). Sensor 1 means the sensor in the exhaust closest to the engine. It should be the O2 in the driver side exhaust manifold or close to it.

Jay

riodog

The code = A/F (o2) sensor circuit response malfunction. Bank 1, sensor 1.

I'd say replace the o2 sensor but then again I don't know nothin.
Rio

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Jetdriver

Thanks again guys. Ill be replacing the driverside o2 today. Is it good to just replace both?

HOSS

no, just one

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OLDSQUIRT

Just a little info from someone who does this chit for a living.....

Just because a code sets that indicates a problem in a circuit, doesn't mean there IS a problem or bad part in that circuit. It simply indicates that the ECU has seen an out of range signal, an open, or short in that circuit. O2 sensors are a classic case of this. The O2 sensor reads what comes out of the engine. ANY problem that causes a rich or lean situation in the engine can trigger an O2 sensor code. On one of the V-6s I routinely work on, the most common cause of a lean O2 code is tight valves. In the case of someone from the boards that I helped about a year ago, an O2 sensor rich malfunction code was the result of a stuck fuel pressure regulator. Part cost about $15. He had already spent HUNDREDS on all new tune-up parts, injectors, etc, etc.....

When you have a code, perform the necessary diagnosis BEFORE you start throwing parts at it in an attempt to fix it. You wil learn a lot more in the process and often times save lots of money.