P0157 trouble code help?

Tech discussions on the L77 6.0L V8.
CrashTestDummy
Posts: 1832
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Re: P0157 trouble code help?

Post by CrashTestDummy » Fri Apr 05, 2019 2:21 pm

lastcall190 wrote:
Mon Apr 01, 2019 8:23 pm
FWIW, making a code not report does not impact inspection/MIL status. Just hit a drive cycle after flashing the computer and you're set.

But if you figured it out to allow for inspection in its current form then great.

-J
The MIL must be off, the code cleared and a certain number of drive cycles must be completed before it will pass inspection. I'm not sure how many cycles that entails, but I did get the car out last Wednesday for some errands, and we got out and back without any lights on the dash. I'll be taking it to do my Saturday errands, and if the lights stay off, I'll swing in for an inspection.

While I'm not 100% certain of a solution yet (once bit, twice shy), I think the issue was a leak in the exhaust system between the cat and the head pipe on the passenger side. If you've read my project thread, you'll note that I had fitment issues with the Solo Perf. cats and the exhaust. The passenger side slid right together, while I had to take a die grinder to the driver's side. I think that slip fit caused some air to be sucked back in, diluting the exhaust stream. I took some thin aluminum sheet and made a 'bushing' to go around the socket on the exhaust head pipe end so that it interference-fits into the cat. I DID note that after the restart, the car sounded a lot quieter.

While road testing with the scanner connected, both secondary O2 sensors were pretty much showing the same readings as I drove. The successful road trip last Wednesday was about 3X the distance I traveled the previous trip before the light came on, so, so far, so good. Fingers crossed we're done here so I can concentrate on getting the brakes finished on the Camaro.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
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lastcall190
Posts: 299
Joined: Mon Sep 11, 2017 10:17 am
Location: North Jersey

Re: P0157 trouble code help?

Post by lastcall190 » Fri Apr 05, 2019 3:15 pm

NJ sounds the same. I would think that scanner might be able to show your readiness monitors? FWIW I had a hell of a time getting the EVAP system to report a ready status (took upwards of driving to and from my job for almost a week). Found that the trick was to let the fuel tank run down a bit, and run it between 25-75% full. There is an actual "procedure" for a drive cycle but IMO it's absolutely ridiculous. Your wider open space in TX might allow it to be more easily done, however.

I've done the aluminum foil exhaust leak solution bit before... worked surprisingly well. I have seen vids of guys putting slip fit connections (and others) together and they throw some copper looking RTV into the joint. Not sure if that might be a good solution as well, though it seems you've got it sorted. I saw your build thread but couldn't remember details.

Good luck on the inspection.

-J
2012 Caprice
!DOD : LS9 Cam : Pat G : Magnaflow : VCM

2008 CVPI
168k and going strong

CrashTestDummy
Posts: 1832
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Re: P0157 trouble code help?

Post by CrashTestDummy » Fri Apr 05, 2019 5:11 pm

Yeah, my scanner shows what standard it's using (Texas) and whether or not it's ready for inspection. I'll check it Saturday. Odd, our 96 SS has a 'lazy' O2 sensor, which sets a MIL about once a quarter. It did that just before taking the car in for inspection. I cleared the code with another scanner/programmer, then rolled out the next day and passed inspection.

I think it has to do with the number of circuits that are marked 'not ready', and I guess the SS is just one, whereas when you clear the code on the O2 sensor on the Caprice, it clears three codes, so I guess it's tripping up on those three. Go figure.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?

CrashTestDummy
Posts: 1832
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Re: P0157 trouble code help?

Post by CrashTestDummy » Sat Apr 13, 2019 8:38 pm

Well, things seem to just keep getting better!! :cry:

I was going to take the car on a bit of a ride today to hopefully get past the 'monitor not ready' issue. THIS time, about the time I got to the end of the driveway, the chimes started going off and lights started coming on. I got an ABS Fault message on the DIC, then Stabilitrack fault. Every once in a while now, when driving the car, it seems the ABS is kicking back, as I can feel the chatter through the brake pedal.

My Android OBDII scanner won't see any such faults, and it seems that the Car Gauge Pro Android App may or may not be compatible with my ELM327 OBD module. I ran the car down to the local parts house, and their scanner showed no codes.

Looks like I get a trip to the Dealership in my future. FML!!!
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?

CrashTestDummy
Posts: 1832
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Re: P0157 trouble code help?

Post by CrashTestDummy » Tue Apr 16, 2019 3:36 am

Found out that there is a reader that will do more than just ECM reads. It’s called Blue Driver. Got the sensor in today, and hooked it up. Seems I have a Left Rear speed sensor error. I’llget A replacement this weekend, and see what happens with that.

C0045 was the error code.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?

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