Hello, So my 2015 Honda Accord Sport failed the air emissions test twice, and it’s been about a year trying to find the cause, with the acceleration starting to be affected Symptoms: Diagnostic Trouble Codes (OTC), reported during air emission fail: P0088 P0455 P0456 -Engine light is always o…

The P0088 DTC indicates that the fuel pressure is too high. Which could indicate a problem with the high pressure fuel pump on your direct injected engine. Tester

[image] Tester: high pressure fuel pump on your direct injected engine Would it be as simple as replacing the high pressure fuel pump? Because from what I’ve read it does match with the jerking motion that occurs sometimes when accelerating to and past the ~30mph mark. (Also, quick edit that …

[image] nutalap2: failed the air emissions test twice, and it’s been about a year trying to find thd cause Me thinks you need to change mechanics or dealership. Whomever is trying to fix it should not be given another chance to fix it.

[image] Tester: P0088 Also, would a high pressure fuel pump failure account for the flashing of seemingly unrelated lights like the traction control and tire pressure lights flashing occuring around the time when the low power at acceleration and jerking occurs?

Yeah, I’ve went to two mechanics/dealerships during that time. First one suggested a whole replacement of the fuel tank (did not go through with this since that seemed inconsistent with the issues), and the other was the one who replaced the fuel cap and the EVAP purge valve. Honestly, I don’t know …

My guess, the emissions failure is caused by the two evap system codes. The leaks are causing the mixture to be overly lean, and the resulting poor engine performance. The fuel pressure has to be correct of course, but if it were too high that would usually cause a too-rich code. Since you a…

Appreciate the advice on the specific test. I was also suggested by the second dealership/mechanic to do smoke test (EVAP smoke test maybe?), would that help or is it anyway related to the issues?

The smoke test would help diagnose the two evap-leak codes. There’s several places leaks can occur in the evap system. The gas cap is one, but it appears you’ve already disproved that possibility. At the top of the fuel tank is another common one. A hose may have come off its connector or the ru…

You have two different issues, the P0088 is an urgent issue, especially if the check engine light/malfunction indicator lamp (CEL/MIL) is flashing. When that light is flashing, there is imminent damage to the catalytic converter occurring. The flashing of the other lights such as traction control …

[image] nutalap2: First one suggested a whole replacement of the fuel tank (did not go through with this since that seemed inconsistent with the issues), P0455 and P0456 are for fuel vapor leaks in the fuel tank or vapor recovery system, seems like a fuel tank leak is a possibility. Repairin…

Stuck in air emission and engine light hell with my honda

Maintenance/Repairs

Tester November 1, 2024, 9:02pm 14

You can’t damage the EVAP system by over-filling the gas tank anymore.

The Onboard Refueling Vapor Recovery system has an over-fill check valve that prevents that from occurring.

It also acts as a roll-over check valve in the event the car ends up on its lid.

Tester

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Stuck in air emission and engine light hell with my honda

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