P209900 and P209700
Thread Starter
Member
Joined: Jan 2024
Posts: 197
Likes: 59
From: Colorado
2018 C63S AMG Coupe, 2019 Jaguar F-Pace SVR
P209900 and P209700
Hello,
I have a 2018 C63S Coupe and I have ModalWorks downpipes with 200 cel Cats, and Zac Motorsports cat-back exhaust and Zac Motorsports intake. I am getting P209700 and P209900 soft codes for a rich condition on both banks. No CEL (yet). I am running on the stock tune. I have 90 adapters and O2 spacers ("defoulers") in the downstream O2 locations. I had been running "mini cats" in the downstream positions but then I was getting all kinds of "slow response" and "stuck lean" codes from the downstream O2's that would set the CEL (so the mini cats were too efficient for my set up). I think those mini cats should only be used in catless downpipes. Removing the "mini cats" stopped those lean and slow response codes but now it thinks it's too rich. I just can't seem to hit the sweet spot.
My question is whether or not the soft codes are normal and I should just quit looking at Xentry and drive it until I get a CEL (or hopefully not) ... Or should I keep chasing down the perfect set up?
After clearing the codes I drove it for about 40 miles, over an hour, in a variety of traffic conditions, like stop and go city and also highway speed, and got no CEL, but I'm afraid the soft codes are set again.
I have a 2018 C63S Coupe and I have ModalWorks downpipes with 200 cel Cats, and Zac Motorsports cat-back exhaust and Zac Motorsports intake. I am getting P209700 and P209900 soft codes for a rich condition on both banks. No CEL (yet). I am running on the stock tune. I have 90 adapters and O2 spacers ("defoulers") in the downstream O2 locations. I had been running "mini cats" in the downstream positions but then I was getting all kinds of "slow response" and "stuck lean" codes from the downstream O2's that would set the CEL (so the mini cats were too efficient for my set up). I think those mini cats should only be used in catless downpipes. Removing the "mini cats" stopped those lean and slow response codes but now it thinks it's too rich. I just can't seem to hit the sweet spot.
My question is whether or not the soft codes are normal and I should just quit looking at Xentry and drive it until I get a CEL (or hopefully not) ... Or should I keep chasing down the perfect set up?
After clearing the codes I drove it for about 40 miles, over an hour, in a variety of traffic conditions, like stop and go city and also highway speed, and got no CEL, but I'm afraid the soft codes are set again.
Thread Starter
Member
Joined: Jan 2024
Posts: 197
Likes: 59
From: Colorado
2018 C63S AMG Coupe, 2019 Jaguar F-Pace SVR
Just to follow-up... Pulled codes again and got P013B00 and P014B00, as well as P219884 and P219684, with the P209900 and P209700... so all four O2 sensors are saying the car is rich, and the downstream O2's are slow to respond. I drove the car 30 miles to work this morning and the CEL came on again. I don't have my computer with me to check codes, but I'm betting they are the same, or maybe the P0420 variety. I'm now thinking that my only way to resolve these codes is to get a tune to adjust the A/F ratio or possibly widen the O2 parameters, or the allowable lambda adjustments, in the ECU. Would love some input from anyone whose been in a similar predicament.
Thread Starter
Member
Joined: Jan 2024
Posts: 197
Likes: 59
From: Colorado
2018 C63S AMG Coupe, 2019 Jaguar F-Pace SVR
I'm now on my third configuration using just some straight defoulers (no 90-degree adapter, no mini-cats). So far so good. Hopefully this post doesn't jinx it.
Thread Starter
Member
Joined: Jan 2024
Posts: 197
Likes: 59
From: Colorado
2018 C63S AMG Coupe, 2019 Jaguar F-Pace SVR
I'm now on my third configuration using just some straight defoulers (no 90-degree adapter, no mini-cats). So far so good. Hopefully this post doesn't jinx it.
