Three problems related to gas recirculation valve (egr valve) have been reported for the 2008 Lexus IS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Lexus IS based on all problems reported for the 2008 IS.
Isfs year models 2008-2014 are affected the valley plate leak due to the fact that Toyota/Lexus utilized the improper sealant and used the improper amount, leading to the heat exchanger leaking coolant once the original, inadequate sealant begins to disentegrate. This could cause a condition where the engine could fail and someone could get hurt. Furthermore, all Isfs will eventually have a cracked rh manifold on the #8 runner. This can cause a fire hazard in addition to carbon monoxide poisoning.
Lexus Isf, year models 2008-2014, are affected by a valley plate leak due to the fact that Toyota/Lexus utilized the improper sealant and used the improper amount, leading to the heat exchanger leaking coolant once the original, inadequate sealant begins to disintegrate. This could cause a condition where the engine could fail and someone could get hurt. This Issue Is very prominent in the community (every Lexus facebook group and forum has documented this information) - most Isfs develop this under 100k miles. Furthermore, all Isfs will eventually have a cracked rh manifold on the #8 runner. This can cause a fire hazard in addition to carbon monoxide poisoning. My 2008 Isf has been leaking coolant for about 15k miles, progressively getting worse (inspected every oil change). In addition, I have to start topping of the coolant every week. Lexus dealer quoted this repair at almost $2000.
Per the forums and used fb groups, all Isfs year models 2008-2014 are affected the valley plate leak due to the fact that Toyota/Lexus utilized the improper sealant and used the improper amount, leading to the heat exchanger leaking coolant once the original, inadequate sealant begins to disintegrate. This could cause a condition where the engine could fail and someone could get hurt. Furthermore, all Isfs will eventually have a cracked rh manifold on the #8 runner. This can cause a fire hazard in addition to carbon monoxide poisoning. I personally had this Issue on my 2008 and know at least 100 owners who have also had this Issue fixed. I am sure many more are out there.