Deancm
Member
I have a 2008 Sprinter 3 liter V6 144" wheel base with 52,000 miles. My UltraGauge scanner started showing 2 trouble codes: P040B was EGR Sensor B Circuit Hi and
P2457 was EGR cooling system performance. Finally the check engine symbol went on. However, everything continued to run fine. Both trouble codes were fixed by replacing the rear temp. sensor.
There are two EGR temp. sensors. They both look the same (see 1st photo) but they are not. One is located in front near the oil dip stick (see 2nd photo) and the other is in the rear, but you can hardly see it from under the hood or from under the truck. (see 4th photo) which is pointing to it from under the hood.
I removed the front sensor, cleaned it with brake cleaner and the trouble codes did not change. So I purchased a new sensor from ebay part # 68012052AB for $128, thinking it was the front sensor because their picture look like the one it took out.
When I got the new sensor the electrical plug end would not fit in the front. It was configured different. (see 3rd photo) for front plug. Notice the slot is off to the side and it is black. Now (see 4th photo) notice the slot is in the middle and it is white. I found out that I had purchased a rear temp. sensor. I installed it in the rear and trouble codes went away!
The rear temp sensor is on the exhaust pipe in front of the catalytic converter. You can barely see the top angle of it. It is removed by feeling for it from under the van and using a 17 mm open end wrench to loosen the nut.
I hope this fix helps someone. I do appreciate the forum.
P2457 was EGR cooling system performance. Finally the check engine symbol went on. However, everything continued to run fine. Both trouble codes were fixed by replacing the rear temp. sensor.
There are two EGR temp. sensors. They both look the same (see 1st photo) but they are not. One is located in front near the oil dip stick (see 2nd photo) and the other is in the rear, but you can hardly see it from under the hood or from under the truck. (see 4th photo) which is pointing to it from under the hood.
I removed the front sensor, cleaned it with brake cleaner and the trouble codes did not change. So I purchased a new sensor from ebay part # 68012052AB for $128, thinking it was the front sensor because their picture look like the one it took out.
When I got the new sensor the electrical plug end would not fit in the front. It was configured different. (see 3rd photo) for front plug. Notice the slot is off to the side and it is black. Now (see 4th photo) notice the slot is in the middle and it is white. I found out that I had purchased a rear temp. sensor. I installed it in the rear and trouble codes went away!
The rear temp sensor is on the exhaust pipe in front of the catalytic converter. You can barely see the top angle of it. It is removed by feeling for it from under the van and using a 17 mm open end wrench to loosen the nut.
I hope this fix helps someone. I do appreciate the forum.
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