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04 XG350 Check engine
01-09-2011, 11:25 PM
Post: #1
04 XG350 Check engine
Hyundai 04 XG350- Check engine light- code P0150/P0154- changed all 4 sensors- check current to sensor with test light and it was getting current-changed the two front cat converters removed the third. New belts-plugs waterpump etc.reset the check engine and after 5-10 minutes it goes on again. 260K on the cloch but the car runs like a dream. Any thoughts?? Thanks Gene
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01-10-2011, 01:18 AM (This post was last modified: 01-10-2011 01:20 AM by Rupe.)
Post: #2
RE: 04 XG350 Check engine
This is like getting a code for an an "E" on the gas gauge. Chances are the tank or the gauge are not at fault and the gauge is telling there's another problem. (tank is empty) Codes for o2 sensors are like that in they usually don't indicate the sensor is bad but do tell you there's a mixture problem. The question becomes rich or lean? (for sensor #1, either bank) The codes for sensor #2 (both sides) usually tells about the ability of the cat to clean the exhaust further. IOW, two possibilities for each set of sensors. The front two are telling you something is rich or lean, which is an engine running issue and the second set are telling you about the general health of the cats, which may be ok and clean up if the other problem is solved.

Yes, the cats may be tired at that mileage but I would go for a full function scan (not just a code reader) to see if the front sensors show rich or lean then chase that problem first. An actual reading of the Mv output will be a clue and the cats will not do their job if the engine is too far out in left field so that will set codes for the rear sensors.
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01-10-2011, 09:17 PM (This post was last modified: 01-10-2011 09:18 PM by modelt609.)
Post: #3
RE: 04 XG350 Check engine
(01-10-2011 01:18 AM)Rupe Wrote:  This is like getting a code for an an "E" on the gas gauge. Chances are the tank or the gauge are not at fault and the gauge is telling there's another problem. (tank is empty) Codes for o2 sensors are like that in they usually don't indicate the sensor is bad but do tell you there's a mixture problem. The question becomes rich or lean? (for sensor #1, either bank) The codes for sensor #2 (both sides) usually tells about the ability of the cat to clean the exhaust further. IOW, two possibilities for each set of sensors. The front two are telling you something is rich or lean, which is an engine running issue and the second set are telling you about the general health of the cats, which may be ok and clean up if the other problem is solved.

Yes, the cats may be tired at that mileage but I would go for a full function scan (not just a code reader) to see if the front sensors show rich or lean then chase that problem first. An actual reading of the Mv output will be a clue and the cats will not do their job if the engine is too far out in left field so that will set codes for the rear sensors.

(01-10-2011 01:18 AM)Rupe Wrote:  This is like getting a code for an an "E" on the gas gauge. Chances are the tank or the gauge are not at fault and the gauge is telling there's another problem. (tank is empty) Codes for o2 sensors are like that in they usually don't indicate the sensor is bad but do tell you there's a mixture problem. The question becomes rich or lean? (for sensor #1, either bank) The codes for sensor #2 (both sides) usually tells about the ability of the cat to clean the exhaust further. IOW, two possibilities for each set of sensors. The front two are telling you something is rich or lean, which is an engine running issue and the second set are telling you about the general health of the cats, which may be ok and clean up if the other problem is solved.

Yes, the cats may be tired at that mileage but I would go for a full function scan (not just a code reader) to see if the front sensors show rich or lean then chase that problem first. An actual reading of the Mv output will be a clue and the cats will not do their job if the engine is too far out in left field so that will set codes for the rear sensors.

Thanks- having the car undergo a full computer scan.
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