Help with P0400 Code (EGR Valve)??
Thread Starter
Newbie
Joined: Jan 2008
Posts: 6
Likes: 0
S430
Help with P0400 Code (EGR Valve)??
Hey all,
I have an '02 S430 (W220) with 116K miles. This morning after driving for 10 minutes, my CEL came on. No malfunctions were displayed on the dashboard. There was one diagnostic code P0400 that was displayed when checked. From what I gather, it's related to the EGR valve.
#1) Where is it located on the car?
#2) Has anyone replaced (DIY) before? Any pictures?
#3) What else should I check that could cause the P0400 code?
Thank you in advance....
I have an '02 S430 (W220) with 116K miles. This morning after driving for 10 minutes, my CEL came on. No malfunctions were displayed on the dashboard. There was one diagnostic code P0400 that was displayed when checked. From what I gather, it's related to the EGR valve.
#1) Where is it located on the car?
#2) Has anyone replaced (DIY) before? Any pictures?
#3) What else should I check that could cause the P0400 code?
Thank you in advance....
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,121
Likes: 86
From: West Plam Beach, FL
'16 S550 Coupe, '11 Lexus LS460, '02 CL500 (SOLD)
Hey all,
I have an '02 S430 (W220) with 116K miles. This morning after driving for 10 minutes, my CEL came on. No malfunctions were displayed on the dashboard. There was one diagnostic code P0400 that was displayed when checked. From what I gather, it's related to the EGR valve.
#1) Where is it located on the car?
#2) Has anyone replaced (DIY) before? Any pictures?
#3) What else should I check that could cause the P0400 code?
Thank you in advance....
I have an '02 S430 (W220) with 116K miles. This morning after driving for 10 minutes, my CEL came on. No malfunctions were displayed on the dashboard. There was one diagnostic code P0400 that was displayed when checked. From what I gather, it's related to the EGR valve.
#1) Where is it located on the car?
#2) Has anyone replaced (DIY) before? Any pictures?
#3) What else should I check that could cause the P0400 code?
Thank you in advance....
Junior Member
Joined: Jan 2010
Posts: 21
Likes: 0
97 c280, 01 ml320, 04 r32
its located on the right side in back of the engine on the top. there is a pipe that goes into the valve its probably clogged. if you have and vacuum pump you can test the valve.i have seen the valves get stuck in which case i would replace it.
Thread Starter
Newbie
Joined: Jan 2008
Posts: 6
Likes: 0
S430
Thanks all for the direction. Found the EGR valve and began disassembling today. Before removing I tested it by pulling vacuum. Didn't start to move until about 6 "water vacuum pressure and then it popped open. Stroked the valve a few times but the opening vacuum pressure wasn't consistent (between 5 - 9 "water). Probably build-up on the valve. Though the engine did "stumble" whenevery I opened the valve so it's not 100% clogged. Also the vacuum pressure held steady so EGR valve diaphragm is not leaking.
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,121
Likes: 86
From: West Plam Beach, FL
'16 S550 Coupe, '11 Lexus LS460, '02 CL500 (SOLD)
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