P0430 code

[ColoradoSilverado]

My SES light just came on and it gives just the P0430 code. My cats have been rattling upon acceleration for the last three years now, seeing that it's just the P0430 code by itself would it most likely be the right catalytic converter ? Truck runs just fine, I bought it with 104,000 miles 4 years ago now I'm at 180,000 miles. It's a 2000 with the 5.3.

Bert

[MT-2500]

Originally Posted by ColoradoSilverado

My SES light just came on and it gives just the P0430 code. My cats have been rattling upon acceleration for the last three years now, seeing that it's just the P0430 code by itself would it most likely be the right catalytic converter ? Truck runs just fine, I bought it with 104,000 miles 4 years ago now I'm at 180,000 miles. It's a 2000 with the 5.3.

Bert

If cats are rattling time to replace them.

http://www.troublecodes.net/articles/catfailure/



DTC P0420, P0421, and P0430 & P0431: Check Possible Cause Of Misfire DTC P0420 and P0421 indicate bank one catalyst system efficiency is minimum requirement. DTC P0430 and P0430 indicate bank 2-catalyst system efficiency is minimum requirement. Possible causes are as follows: Use of leaded fuel. Oil contamination. Cylinder misfire. Fuel pressure too high. HO2S sensor improperly connected. Damaged exhaust system component. Faulty ECT sensor. Faulty HO2S. Ensure ignition timing is correct. Retrieve all Continuous Memory DTCs. If misfire code is not present, go to next step. If misfire code is present, isolate cylinder and repair as necessary. Check HO2S Monitor DTCs If DTCs P0136, P0138, P0140, P0141, P0156, P0158, P0160, or P0161 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step. Check ECT Sensor DTCs If DTCs P0117, P0118, P0125 or P1117 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step. If any codes except P0420, P0421, P0430 and/or P0430 were present in step 1), service as necessary before continuing. If no codes except P0420 and/or P0430 were present in step 1), go to next step. Check Rear HO2S Wiring Harness Turn ignition off. Ensure HO2S wiring harness is correctly routed and connectors are tight. Repair or replace as necessary. If wiring harness and connectors are okay, go to next step. Check Fuel Pressure Turn ignition off. Release fuel pressure. Install fuel pressure gauge. Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to CIRCUIT TEST HC. Check For Exhaust System Leaks If exhaust system leaks, it may cause catalyst monitor efficiency test to fail. Inspect exhaust system for cracks, loose connections or punctures. Repair or replace as necessary. If exhaust system is okay, go to next step. Check For Exhaust System Restrictions Inspect exhaust system for collapsed areas, dents or excessive bending. Repair or replace as necessary. If exhaust system is okay, go to next step. Check Manifold Vacuum Install tachometer. Connect vacuum gauge to intake manifold vacuum source. Start engine and raise engine speed to 2000 RPM. Manifold vacuum should rise to more than 16 in. Hg. If manifold vacuum is okay, go to next step. If manifold vacuum is low, go to step 11). Leave tachometer and vacuum gauge connected. Start engine and raise engine speed to 2000 RPM. On a non- restricted system, manifold vacuum should quickly rise to normal range as increased RPM is maintained. On a restricted system, manifold vacuum will slowly rise to normal range as increased RPM is maintained. If manifold vacuum is okay, no indication of exhaust leak or restriction has been detected and testing is complete. If manifold vacuum is low or slow to respond, go to next step. Leave tachometer and vacuum gauge connected. Remove exhaust pipe from exhaust manifold. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is downstream from exhaust manifold. Reconnect exhaust pipe to exhaust manifold and go to next step. If manifold vacuum is still low or slow to respond, fault is in exhaust manifold or intake manifold gasket. Repair or replace as necessary and repeat QUICK TEST. Leave tachometer and vacuum gauge connected. Disconnect muffler/tailpipe assembly from rear of catalytic converter. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is in muffler/tailpipe assembly. Repair or replace as necessary and test-drive vehicle to verify elimination of symptom. If manifold vacuum is still not okay, fault is in catalytic converter. Repair or replace as necessary. Check tailpipe/muffler assembly for debris from catalytic converter. Test drive vehicle to verify elimination of symptom.

[ColoradoSilverado]

Well, the SES light turned off so I won't do anything with the truck for now. I think i just want to hollow out my cats, yes I know it's illegal and that it will throw a code but the''re suppose to be dummy O2 sensors I can put in ? Anyone hollowed out their cats and can tell me how it worked out ?

Bert

[MT-2500]

Originally Posted by ColoradoSilverado

Well, the SES light turned off so I won't do anything with the truck for now. I think i just want to hollow out my cats, yes I know it's illegal and that it will throw a code but the''re suppose to be dummy O2 sensors I can put in ? Anyone hollowed out their cats and can tell me how it worked out ?

Bert

Best to fix the problem.
Your emmision system and engine running systems need the cats and 02 sensors to work right and the engine to run right,

Yes they make dummie sensors.
But fix it right if you want everything to work right.
Good Luck

[sierra99]

I had a p0420 code and had to pass my county emissions and did not have the $450 or the time to replace it. I found a site that sold a o2 simulator. Do a Google search for "o2 simulator" and the company is called Afterthoughts. ( I hope I do not tick off any mods). I got me past my emissions test, and I will replace my cat this summer


BUT. I do occasionally get a code of p0130 which is something like "o2 sensor over voltage" it comes on and usually goes out the next morning. I did get this code once in the last 5 months but it went off the next day. I would try the anti foul plug adapter trick, just to get you through, till you can get the cats changed.

By the way can somebody suggest a good palce and price for a Cat "y" pipe for a 99 silverado 5.3l?

If you want you can pm me and ask me more. Just trying to help out

Also I did have a intake gasket leak. I will try to put everything back to normal and see what happens