2018 Tiguan SEL AWD, 51k — P0203 back after warranty harness fix. Dealer wants to replace all four injectors + carbon clean.
In early August, my beloved Tiguan went into limp mode with the engine check light on. OBD scanner showed the error code - P0203. I took it to the dealer who replaced the injector harness under warranty. I drove off the lot and the light came right back on. They said that the harness connecter had not seated properly and redid it. For about a month post that, the car ran beautifully, and the driving felt a lot more effortless.
Then in early September, engine check light came back on with the same code, and the car was back in the limp mode. Restarting the car cleared the engine check light, but P0203 was still in the stored codes and it hasn't felt quite right since. There's a bit of engine hesitance. The code hasn't come back in the month since.
I took it back to the dealer to get it re-checked. Post running their diagnostics, they said that it is an intermittent issue and recommended replacing all four injectors plus a carbon cleaning.
A few questions for anyone who's dealt with this:
- Does going straight to all four injectors make sense?
- If you had P0203 come back after a harness replacement, what actually fixed it?
- Is the carbon clean actually related, or just an add-on?
Mostly I'm worried about it crapping out on me during a long drive. Appreciate any advice!