Check Engine Light

[G8GTlawride]

Just got a CEL while driving around town. Called On-Star and they blurped out code P1133. Check it with the dashawk and low and behold the DH shows it as unknown! Imagine that. To top that off, the DH won't clear it! Any thoughts? I think it is fuel related but not sure as it is not listed with the dashawk list of codes. Thanks.

[wreckwriter]

P1133 HO2S Insufficient Switching

O2 sensor code. got that from: http://www.engine-light-help.com/gm-trouble-codes.html

[G8-SSV]

For G8 DTC P1133: HO2S Insufficient Switching Bank 1 Sensor 1


P1133
• DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.

• The ECT Sensor parameter is more than 60°C (140°F).

• The Engine Speed parameter is between 1,200-3,000 RPM.

• The Ignition 1 Signal parameter is between 10-18 volts.

• The Engine Run Time parameter is more than 160 seconds.

• The Loop Status parameter is Closed.

• The TP Indicated Angle parameter is more than 5 percent.

• The Fuel Level Sensor parameter is more than 10 percent.

• The BARO Pressure parameter is more than 70 kPa.

• The MAF Sensor parameter is between 20-55 g/s.

• DTC P1133 runs once per drive cycle when the above conditions are met for 1 second.





P1133
• The ECM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.

• DTC P1133 sets within 100 seconds when the above condition is met.

[GRRRR8]

Have you had it tuned for the headers? More then likely it is a bad 02 with that code.

[G8GTlawride]

Have you had it tuned for the headers? More then likely it is a bad 02 with that code.

Yes, it is Vector tuned via the FXP. It has been for quite a while now. I don't have AFM activated either. Thought it might be bad sensor but also fuel qualitiy as I just filled the tank yesterday. Have always used BP premium. What a P....er!

Gonna drive it so will anything break?

[Chewy]

Yes, it is Vector tuned via the FXP. It has been for quite a while now. I don't have AFM activated either. Thought it might be bad sensor but also fuel qualitiy as I just filled the tank yesterday. Have always used BP premium. What a P....er!

Gonna drive it so will anything break?

Nope! Fueling may be off a bit. Fuel milage may suffer.

[GRRRR8]

It really wont have much of an effect on anything. Worse case 1- mpgs due to efficiency.

[G8GTlawride]

Thanks all. Gonna try to get it reset.

[G8GTlawride]

Paid a visit to my local Chevrolet dealer, though not through the front door, (should have seen all the sales folks staring at the G8 as I drove by!) and spoke to a friend who works there. Cleared the code and checked the sensor with the Tech II. All is well. The code was only thrown once. He did say that the sensor could be the culprit but he has seen the issue come up before due to using non-Top Tier fuel. I think that has been posted on here recently. He recommended Chevron or Shell. Time to go drive and use up the NEW tank of BP! Thanks for all the help.

[wreckwriter]

Cool. Glad you got it working.

[G8GTlawride]

Thanks Tom, I really appreciate the responses from so many folks I may never meet or know! The willingness to help amazes me.

[wreckwriter]

Thanks Tom, I really appreciate the responses from so many folks I may never meet or know! The willingness to help amazes me.

That's why we all come here :) Everyone helps everyone else at some point.