Check engine p0141 p0420

Hi.

I need help......

My 1998 totyota camry, 4cyl with CA emmission... 52000 miles, one day on road, even I push gad padel all the way to floor, RPM wasn't going up. Went to auto mechanics, he told me that it was a Oxygen sensor after Catalyst converter.... I went to norwood auto, by a generic one and installed,it was last for only one month and CEL comes on again... I went to autozone, they told me again that Oxy sensor went bad.. I bought a Bosch generic ( cost me $86 again)...it last almost 6-7 month and again same scenerio.....

I went to autozone, its say code P0420 Catalyst System Efficiency Below Threshold (Bank 1), advice to change me Oxygen sensor again.... I took the battery lead out and reset CEL, went for inspection, its shows almost all component not ready state and it failed the inspection. CEL stays of for almost 20-25 miles and came back again..Now this time its gave me code P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)... Again its says Oxygen sensor.....

Now, I am tired.... changed 2 Oxy sensor cost 170 dollar and keep going bad... Any Idea? I changed Air Filter, oil, checked spark plugs, everything is ok.... any way to by-pass O2 sensor?
Where I can buy a Toyota original parts on internet? not dealer?

I am not a original owner, is this car covered under any toyota warranty?

any good OBD-II scanner for personal use, model# please?

Are you burning oil or running rich? Soot can build up on these sensors and make them fail.

:banghead:
Hi RIP,
Thanks for your reply.....Anyway, I went to Autozone and its shows P0141, mean heated Oxygen sensor 2, Bank 1 (one after Catalyst converter) and that sensor I had replaced twice in 1.5 yrs.......

So this time, I went to toyota dealer and bought Oxy sensor ( cost me @ $157 + Tax) and replace it...reset ECM ( Electronic Control Module) by removing battery lead for approx 5 minute....Went to MV for inspection failed, showing Cat converter and Oxy Sensor ..."Not Ready"..... Its required to drive a car about 10-15 mile and atleast 5-6 min with 55/60 mph to set all parameters.... So I drove my car for 2-3 days and went for MV Inspection and it passed....................... Thanks god...CEL (Check Engine Light) is disappear now....No more,.......:screwy: :nono:

Moral of the story is for sensitive parts like sensors, please get from the authorized dealer....its worth whan you comapare price with labor...

Anyone know, where you can buy genunine toyota parts besides the dealer?

Thanks everyone...........:popcorn:

Hi.

I need help......

My 1998 totyota camry, 4cyl with CA emmission... 52000 miles, one day on road, even I push gad padel all the way to floor, RPM wasn't going up. Went to auto mechanics, he told me that it was a Oxygen sensor after Catalyst converter.... I went to norwood auto, by a generic one and installed,it was last for only one month and CEL comes on again... I went to autozone, they told me again that Oxy sensor went bad.. I bought a Bosch generic ( cost me $86 again)...it last almost 6-7 month and again same scenerio.....

I went to autozone, its say code P0420 Catalyst System Efficiency Below Threshold (Bank 1), advice to change me Oxygen sensor again.... I took the battery lead out and reset CEL, went for inspection, its shows almost all component not ready state and it failed the inspection. CEL stays of for almost 20-25 miles and came back again..Now this time its gave me code P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)... Again its says Oxygen sensor.....

Now, I am tired.... changed 2 Oxy sensor cost 170 dollar and keep going bad... Any Idea? I changed Air Filter, oil, checked spark plugs, everything is ok.... any way to by-pass O2 sensor?
Where I can buy a Toyota original parts on internet? not dealer?

I am not a original owner, is this car covered under any toyota warranty?

any good OBD-II scanner for personal use, model# please?

code 420/430 is a lot of times a engine running or tune up problem.
Always check that end first.

And also remember the emission warranty on cats is 8 year or 80K.
And calf may be more.
I think it reverts to a second owner to. But check to make for sure.

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

And here is a little info on code 420. :grinyes: :lol:

DTC P0420, P0421, P0430 & P0431: Check Possible Cause Of Misfire DTC P0420 and P0421 indicates bank one catalyst system efficiency is minimum requirement. DTC P0430 and P0430 indicates 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(s) is not present, go to next step. If misfire code(s) 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. Ć 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 engineand 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.