Repair Tech
Toyota Camry repair keeps coming back — what am I missing?
I've been having a recurring issue with a 2016 Toyota Camry that just won't seem to stay fixed. Initially, it came in for a check engine light, and I diagnosed a faulty O2 sensor. After replacing it, the light stayed off for a couple of days, but then it came back on. I ran another scan and found multiple codes — it seems to be a mix of lean fuel trim and a misfire. I'm starting to feel like I'm chasing my tail here. Any insights on what I might be overlooking? I did a full inspection, including the fuel system and air intake. I've consulted with some local techs who suggested checking the fuel injectors and mass airflow sensor, but those seem fine. I'm using ShopWare for my workflow, and I’m tracking the repairs, but I still feel like there's a piece missing. Any thoughts on parts vendors or other common issues with this model that I should consider?
2 Answers
It sounds like you're doing a thorough job, but I'd recommend double-checking the fuel system, especially the fuel pump and filter. The lean codes can often be attributed to insufficient fuel supply, and if the injectors are clean but the pressure is low, you could be looking at a pump issue. I’ve had similar experiences where after replacing the O2 sensor, it turned out to be the fuel pump that was causing intermittent lean conditions. You can source a pump from RockAuto or even check with your local parts supplier for better prices. Also, make sure to clear the codes and see if they return after a test drive. Also, consider using a data logging tool to monitor live fuel trims and short-term/long-term adjustments while the car is running. It might give you a clearer picture of what's happening when the vehicle is under load. Good luck!
I sympathize with your frustration. Another angle to consider is the possibility of vacuum leaks. Sometimes, a small leak can throw off the air-fuel mixture and lead to those specific error codes. Check all vacuum lines and make sure the intake manifold is sealed properly. You might also want to try a smoke test if you haven't already — it can reveal hard-to-find leaks. As for parts, I’ve had good luck with CarParts.com for injectors and O2 sensors; just make sure they have a solid return policy in case it doesn't solve the issue. Keep us posted!