Need help with P0137/0157 and P1133/1153 Please... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Steve in Naptown · 08-19-2025, 01:14 PM

Hi Folks. New to this forum and new to Gen5 ownership...and already I have a DTC problem and need help.

Car is a 2010 2SS with 68K on the clock. Just bought from an enthusiast in PA where there are no emissions, so it came with long tube headers, cat delete and a 3” Flowmaster cat back setup with resonnator delete and minimal mufflers. It was LOUD.

Since MD is definitely an emissions state, I kept the LT headers and pre O2 sensors, installed high flow cats, a stock 2 ½ system with post cat O2 sensors and a Legato 3” axle back setup. Sounds very nice and not overpowering.

Since the car did not throw any codes when I got it, I assume it had a tune which omitted the post cat O2 sensors but I also assume that an ECM that ignored the post cat O2 sensors wouldn't pass MD emissions. Anyone know if this is true.

Loaded a Diablosport tune for starters and immediately got 4 codes:

0133/1153 –Pre Cat O2 sensors – insufficient switching
1133/1153 - Post Cat O2 sensors – circuit low voltage

I doubt all 4 sensors would simultaneously fail or have wiring issues so I assume it's a tune issue

I have an Autel scanner and it showed that the car is operating in closed loop and all 4 O2 sensors are sending signals but voltages range between 0 and 1 volt. Never gets any higher.

A search of the archives here suggests that headers may require a faster switching O2 sensor like ones for a Corvette. Also suggests that low voltage could be a wiring problem, but a cursory inspection of the wiring shows no kinks, melting or corrosion of the connectors.

So here are the questions:

Can a custom tune solve this issue?
Do I likely need to go to faster switching O2 sensors, and if so, which are best?
Are there any other tests I can do with a scanner to pinpoint the problems?
Can I reload the old tune, disconnect the post cat O2 sensors and get through MD emissions?

Thanks for any advice you can offer.

Steve in Naptown.

Joe.G · 08-20-2025, 08:27 AM

Did you put the factory tune back in before using the new tuner? I believe your issue is going to be with the tune and with your set up may need a custom tune probably will be able to be done though the mail as this is a basic set up.
Evey state tests for emissions different, Some look further into ECM than others and I have no clue what your stat does, If it is just a visual and a check to make sure no cels are on and all monitors are set you may be fine with rears tuned out.

08-19-2025, 01:14 PM	#1
Steve in Naptown Drives: 2010 Camaro 2SS Join Date: Aug 2025 Location: Annapolis, MD Posts: 1	Need help with P0137/0157 and P1133/1153 Please... Hi Folks. New to this forum and new to Gen5 ownership...and already I have a DTC problem and need help. Car is a 2010 2SS with 68K on the clock. Just bought from an enthusiast in PA where there are no emissions, so it came with long tube headers, cat delete and a 3” Flowmaster cat back setup with resonnator delete and minimal mufflers. It was LOUD. Since MD is definitely an emissions state, I kept the LT headers and pre O2 sensors, installed high flow cats, a stock 2 ½ system with post cat O2 sensors and a Legato 3” axle back setup. Sounds very nice and not overpowering. Since the car did not throw any codes when I got it, I assume it had a tune which omitted the post cat O2 sensors but I also assume that an ECM that ignored the post cat O2 sensors wouldn't pass MD emissions. Anyone know if this is true. Loaded a Diablosport tune for starters and immediately got 4 codes: 0133/1153 –Pre Cat O2 sensors – insufficient switching 1133/1153 - Post Cat O2 sensors – circuit low voltage I doubt all 4 sensors would simultaneously fail or have wiring issues so I assume it's a tune issue I have an Autel scanner and it showed that the car is operating in closed loop and all 4 O2 sensors are sending signals but voltages range between 0 and 1 volt. Never gets any higher. A search of the archives here suggests that headers may require a faster switching O2 sensor like ones for a Corvette. Also suggests that low voltage could be a wiring problem, but a cursory inspection of the wiring shows no kinks, melting or corrosion of the connectors. So here are the questions: Can a custom tune solve this issue? Do I likely need to go to faster switching O2 sensors, and if so, which are best? Are there any other tests I can do with a scanner to pinpoint the problems? Can I reload the old tune, disconnect the post cat O2 sensors and get through MD emissions? Thanks for any advice you can offer. Steve in Naptown. Last edited by Steve in Naptown; 08-19-2025 at 01:39 PM.

08-20-2025, 08:27 AM	#2
Joe.G Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021 Location: NY Posts: 1,647	Did you put the factory tune back in before using the new tuner? I believe your issue is going to be with the tune and with your set up may need a custom tune probably will be able to be done though the mail as this is a basic set up. Evey state tests for emissions different, Some look further into ECM than others and I have no clue what your stat does, If it is just a visual and a check to make sure no cels are on and all monitors are set you may be fine with rears tuned out. __________________ GM 3.91/TrueTrac OEM ZL1 Rims, 6 Piston Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, GC Aluminum DS,Stainless Works Ceramic LTH/HiFlo Cats, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace, Moroso Catch Can,SCT X4 Dynosteve,Remote Clutch reservoir,Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights AeroForce Dual gauge/Autometer pillar mount.