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Old 10-12-2005, 04:47 PM   #1
rpressley
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P0420 trouble code?

I have a 2002 C5. My check engine light came on today with a code of P0420. TWC System Low Efficiency Bank 1 . Anybody know what this is and/or how to fix it? I reset the code and the check engine light went off. I assume if im having a failue it will come back.

Thanks.


i fixed the post

Last edited by rpressley; 10-12-2005 at 07:24 PM.
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Old 10-12-2005, 05:06 PM   #2
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OBD II DTC P0240 relates to a turbocharger (Boost Sensor B Circuit Range/Performance).

P420 is Bank 1 O2 sensor.
And I see you have prior fuel issues: P0230 Fuel Pump Primary Circuit Malfunction.

Check your codes again.

C'ya
D
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Old 10-12-2005, 07:23 PM   #3
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the code is a P0420. typo...
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Old 10-12-2005, 08:07 PM   #4
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PCM determined O2 storage capacity for the CAT has degraded below calibrated threshold.

Check that HO2S's are secure and pigtail wiring is not damaged/contacting the exhaust.
Is CAT OEM?
Any visible damage to CAT?
Any CAT rattle?
Any exhaust system leaks, damage, lose/missing hardware (primarily from CAT to HO2S#2).

Replace CAT.

PCM turns OFF after 3 consecutive RUN-NO FAILS, or BAT voltage is disconnected.
History clears after 40 consecutive warm ups, NO FAIL.
Scan Tool clears code also.

C'ya
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Old 10-12-2005, 08:40 PM   #5
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thanks for the info, the code appeared after a hard acceleration while getting on the highway. I have had the fuel gauge problem lately also, I wonder if this could be related.
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Old 10-12-2005, 08:43 PM   #6
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Quote:
Originally posted by rpressley
thanks for the info, the code appeared after a hard acceleration while getting on the highway. I have had the fuel gauge problem lately also, I wonder if this could be related.
Doubt it.. Check for HO2S wiring touching the headers. This is a reported, common issue.

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Old 10-12-2005, 08:46 PM   #7
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Quote:
Originally posted by rpressley
thanks for the info, the code appeared after a hard acceleration while getting on the highway. I have had the fuel gauge problem lately also, I wonder if this could be related.
Do you have CATS (catalytic convertors) on the car? If not you'll get this code from the rear O2's. The other related code is P0430 for bank 2's rear O2.

If you DO have CATS then the one on the driver's side, bank one may be going bad, or simply the O2 on that side is bad (rear).

Enjoy.
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Old 10-12-2005, 08:54 PM   #8
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It's all factory. No mods.
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Old 10-12-2005, 09:03 PM   #9
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Quote:
Originally posted by rpressley
It's all factory. No mods.
Ah, then watch for that code again and if you see it, get it looked with a scan tool. Very slow fluctuations in voltage on that B1S2 sensor will indicate that, most likely, the sensor, not the CAT is going bad. What you should see are values that are close to the front O2 sensor (B1S1) but it reads a little slower, like it's trying to catch up. If it just reads high values (800Mv+) most of the time, then the CAT is suspect. Also, smell your exhaust on the driver's side. Is it stinky? Like rotten eggs? That's the clearest sign of a bad CAT.

Good luck!
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