cat and/or O2 sensor
#1
#4
Code 4-4-3?
Quote from the factory manual:
Code 4-4-3 (TWC* Efficiency); *I believe TWC = Three Way Cat
1) Check for other codes. If any code for misfiring is stored
(Codes 4-5-1, 4-5-2, 4-5-3, 4-5-4, 4-5-5, 5-4-2, 5-4-3, 5-5-1, 5-5-2,
5-5-3, 5-5-4, 5-5-5, 5-4-4 or 5-4-5) perform that testing first. If
Codes 4-3-5 or 4-3-6 are stored, perform testing for that code first.
If none of the above codes are stored, go to next step.
2) Perform a compression check on all cylinders. Repair as
necessary. If compression is okay, go to next step.
3) Check for air leakage in intake system. Repair as
necessary. If there is no air leakage in intake system, check for air
leakage in exhaust system. Repair as necessary. If there is no air
leakage in exhaust system, check fuel and residual pressure. Repair as
necessary.
It seems to me the trouble is either in the fuel control or O2 sensor, dumping excessive fuel into the combustion chamber. If the cat was shot, you would have noticed:
- Rattling noise (depending on the type of the cat).
- Rotten egg smell out of the tail pipe.
- Loss of power/vehicle speed does not rise at certain point.
- Out-of-spec emissions.
I would double check the code as suggested by Tech.
JPN
Quote from the factory manual:
Code 4-4-3 (TWC* Efficiency); *I believe TWC = Three Way Cat
1) Check for other codes. If any code for misfiring is stored
(Codes 4-5-1, 4-5-2, 4-5-3, 4-5-4, 4-5-5, 5-4-2, 5-4-3, 5-5-1, 5-5-2,
5-5-3, 5-5-4, 5-5-5, 5-4-4 or 5-4-5) perform that testing first. If
Codes 4-3-5 or 4-3-6 are stored, perform testing for that code first.
If none of the above codes are stored, go to next step.
2) Perform a compression check on all cylinders. Repair as
necessary. If compression is okay, go to next step.
3) Check for air leakage in intake system. Repair as
necessary. If there is no air leakage in intake system, check for air
leakage in exhaust system. Repair as necessary. If there is no air
leakage in exhaust system, check fuel and residual pressure. Repair as
necessary.
It seems to me the trouble is either in the fuel control or O2 sensor, dumping excessive fuel into the combustion chamber. If the cat was shot, you would have noticed:
- Rattling noise (depending on the type of the cat).
- Rotten egg smell out of the tail pipe.
- Loss of power/vehicle speed does not rise at certain point.
- Out-of-spec emissions.
I would double check the code as suggested by Tech.
JPN
#7
#8
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jrichardson
Volvo S40
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05-24-2012 01:06 PM