Help!
Thread Starter
Joined: Jun 2013
Posts: 2
Likes: 0
Help!
Any suggestions, my daughter has a 2004 Crossfire that has the check engine light on. Emissions diagnosed the code as P2098. The dealer here in town looked at the vehicle and diagnosed it the left up and left downstream 02 sensors need to be replaced (at a cost of over $1200). My boyfriend bought the 02 sensors and replaced all four of them. He cleared the codes and the car was driven for the "recycle period" only to have the check engine light come on again with the same code? Any suggestions?
Also from what Emissions is telling me the code does not need to be cleared that once the correct diagnosis is found and the repairs done the check engine light will turn itself off without being reset.
Any help anyone can give is greatly appreciated.
JB
Also from what Emissions is telling me the code does not need to be cleared that once the correct diagnosis is found and the repairs done the check engine light will turn itself off without being reset.
Any help anyone can give is greatly appreciated.
JB
Senior Member
Joined: Apr 2006
Posts: 25,432
Likes: 647
From: Ontario
Re: Help!
Any suggestions, my daughter has a 2004 Crossfire that has the check engine light on. Emissions diagnosed the code as P2098. The dealer here in town looked at the vehicle and diagnosed it the left up and left downstream 02 sensors need to be replaced (at a cost of over $1200). My boyfriend bought the 02 sensors and replaced all four of them. He cleared the codes and the car was driven for the "recycle period" only to have the check engine light come on again with the same code? Any suggestions?
Also from what Emissions is telling me the code does not need to be cleared that once the correct diagnosis is found and the repairs done the check engine light will turn itself off without being reset.
Any help anyone can give is greatly appreciated.
JB
Also from what Emissions is telling me the code does not need to be cleared that once the correct diagnosis is found and the repairs done the check engine light will turn itself off without being reset.
Any help anyone can give is greatly appreciated.
JB
Do a search here (click) on the forum for 'p2098' and see what you get, one of the problems was poor connection of the connector at the sensor.
Senior Member
Joined: Dec 2010
Posts: 12,780
Likes: 184
From: Lineville, AL
Re: Help!
The P2098 does say "too lean".
Might this possibly be due to low fuel pressure to the injectors, or clogged injectors ?
You can test the fuel pressure at the test point right front of the fuel rail on top of the engine.
54 to 61 psi is what you want to see ........
Maybe want to change the fuel filter just for grins ......
Could also be a catalytic converter ( or more than one ) going south :
From the manual :
Might this possibly be due to low fuel pressure to the injectors, or clogged injectors ?
You can test the fuel pressure at the test point right front of the fuel rail on top of the engine.
54 to 61 psi is what you want to see ........
Maybe want to change the fuel filter just for grins ......
Could also be a catalytic converter ( or more than one ) going south :
From the manual :
CATALYST MONITOR
DESCRIPTION - To comply with clean air regulations, vehicles are equipped with catalytic converters. These converters
reduce the emission of hydrocarbons, oxides of nitrogen and carbon monoxide.
Normal vehicle miles or engine misfire can cause a catalyst to decay. A meltdown of the ceramic core can cause a
restriction of the exhaust. This can increase vehicle emissions and deteriorate engine performance, driveability and
fuel economy.
The catalyst monitor uses dual oxygen sensors (O2Ss) to monitor the efficiency of the converter. The dual O2S
strategy is based on the fact that as a catalyst deteriorates, its oxygen storage capacity and its efficiency are both
reduced. By monitoring the oxygen storage capacity of a catalyst, its efficiency can be indirectly calculated. The
upstream O2S is used to detect the amount of oxygen in the exhaust gas before the gas enters the catalytic converter.
The PCM calculates the air/fuel mixture from the output of the O2S. A low voltage indicates high oxygen
content (lean mixture). A high voltage indicates a low content of oxygen (rich mixture).
When the upstream O2S detects a high oxygen condition, there is an abundance of oxygen in the exhaust gas. A
functioning converter would store this oxygen so it can use it for the oxidation of HC and CO. As the converter
absorbs the oxygen, there will be a lack of oxygen downstream of the converter. The output of the downstream O2S
will indicate limited activity in this condition.
As the converter loses the ability to store oxygen, the condition can be detected from the behavior of the downstream
O2S. When the efficiency drops, no chemical reaction takes place. This means the concentration of oxygen
will be the same downstream as upstream. The output voltage of the downstream O2S copies the voltage of the
upstream sensor. The only difference is a time lag (seen by the PCM) between the switching of the O2Ss.
To monitor the system, the number of lean-to-rich switches of upstream and downstream O2Ss is counted. The ratio
of downstream switches to upstream switches is used to determine whether the catalyst is operating properly. An
effective catalyst will have fewer downstream switches than it has upstream switches i.e., a ratio closer to zero. For
a totally ineffective catalyst, this ratio will be one-to-one, indicating that no oxidation occurs in the device.
The system must be monitored so that when catalyst efficiency deteriorates and exhaust emissions increase to over
the legal limit, the MIL will be illuminated.
DESCRIPTION - To comply with clean air regulations, vehicles are equipped with catalytic converters. These converters
reduce the emission of hydrocarbons, oxides of nitrogen and carbon monoxide.
Normal vehicle miles or engine misfire can cause a catalyst to decay. A meltdown of the ceramic core can cause a
restriction of the exhaust. This can increase vehicle emissions and deteriorate engine performance, driveability and
fuel economy.
The catalyst monitor uses dual oxygen sensors (O2Ss) to monitor the efficiency of the converter. The dual O2S
strategy is based on the fact that as a catalyst deteriorates, its oxygen storage capacity and its efficiency are both
reduced. By monitoring the oxygen storage capacity of a catalyst, its efficiency can be indirectly calculated. The
upstream O2S is used to detect the amount of oxygen in the exhaust gas before the gas enters the catalytic converter.
The PCM calculates the air/fuel mixture from the output of the O2S. A low voltage indicates high oxygen
content (lean mixture). A high voltage indicates a low content of oxygen (rich mixture).
When the upstream O2S detects a high oxygen condition, there is an abundance of oxygen in the exhaust gas. A
functioning converter would store this oxygen so it can use it for the oxidation of HC and CO. As the converter
absorbs the oxygen, there will be a lack of oxygen downstream of the converter. The output of the downstream O2S
will indicate limited activity in this condition.
As the converter loses the ability to store oxygen, the condition can be detected from the behavior of the downstream
O2S. When the efficiency drops, no chemical reaction takes place. This means the concentration of oxygen
will be the same downstream as upstream. The output voltage of the downstream O2S copies the voltage of the
upstream sensor. The only difference is a time lag (seen by the PCM) between the switching of the O2Ss.
To monitor the system, the number of lean-to-rich switches of upstream and downstream O2Ss is counted. The ratio
of downstream switches to upstream switches is used to determine whether the catalyst is operating properly. An
effective catalyst will have fewer downstream switches than it has upstream switches i.e., a ratio closer to zero. For
a totally ineffective catalyst, this ratio will be one-to-one, indicating that no oxidation occurs in the device.
The system must be monitored so that when catalyst efficiency deteriorates and exhaust emissions increase to over
the legal limit, the MIL will be illuminated.
Senior Member
Joined: Jun 2008
Posts: 1,920
Likes: 25
From: Spacecoast, Florida
Re: Help!
If this has never been done before, I would highly recommend you do it. Especially on a 04. Here's a link to grip grip's how to for the Seafoam treatment that will help in more ways than one, and may clean out whatever is causing the sensors to foul.
https://www.crossfireforum.org/forum...tml#post677672
https://www.crossfireforum.org/forum...tml#post677672
Senior Member
Joined: Jan 2007
Posts: 1,751
Likes: 5
From: Lexington Kentucky
Re: Help!
Don;t spend the money , the car is running good ? check for air leaks , the boots that are around the MAF can leak air , clean and check all before doing this , I had this go on for more then a yr , and found out it was the boots around MAF , Most time it air leak , that can give you this code too P2098 and or P2096 , check muffler for any leak , Hope this help , any air leak from anywhere will give this code too
Thread Starter
Joined: Jun 2013
Posts: 2
Likes: 0
Re: Help!
Thanks all for the help... It is going to sit for a bit while boyfriend is out fighting a wildfire but again thanks all for your help. I will let you know how it goes next month when we try these things out.