2018 Ford Focus: misfire or rough idle

Filed Oct 8, 2026 · Acceleration, Fuel system · OR

when the vehicle accelerates too quickly or up a very gradual hill, barely any slope, it will slow to a stop. this is in line with the current recalls with other Ford focus 2018s likely caused by the Canister Purge Valve. it has the exact same symptoms, poor fuel economy, rough idling so much so the entire vehicle shakes, and the dangerous part- stalling. I have now stalled 4 times and have been in and out of multiple mechanics for this issue and no one can seem to identify the root and it's getting costly. now they are saying it might be the canister purge valve but if it is I think it should be covered despite my vin not being perfectly aligned because it's ultimately the same issue with the same vehicle, make and model.

Filed Oct 7, 2026 · Engine · 63,126 miles · AZ

The contact owns a 2018 Ford Focus. The contact stated that after the vehicle was repaired under a recall, while driving 45 MPH, the vehicle unexpectedly idled, causing the engine to misfire with the check engine warning light illuminated. The contact stated that the vehicle sputtered during the misfire. The vehicle was taken to the dealer, where the contact was informed that the engine needed to be repaired. The vehicle was repaired; however, the failure recurred. The vehicle was taken back to the dealer to be diagnosed, and it was determined that the cylinder wall had failed and the engine needed to be replaced. The contact was concerned that the failure was caused by an improper recall repair. The contact stated that the failure had not occurred until after the recall repair was performed. The manufacturer was made aware of the failure by telephone, and a case was opened. The failure mileage was approximately 63,126.

Filed Sep 3, 2026 · Engine, Fuel system · IA

There was supposedly a recall of 2012-2018 Ford focuses such as mine, which is a 2018, but somehow my car is not included in this recall even though it seems to be affected by the same problem. I believe it to have a faulty purge valve (forgive me if I am not precise in my terminology) as it stalls after I get gas and try to start it up. I have to rev the engine to get it to stay on. I cannot stop after I get it started because it roughly idles and seems like it will shut back off if I do, which makes this a little dangerous as well as damaging for my car. I am distressed that my car is not included in this recall because I desperately need to repair it before I ruin my engine but I cannot because I don't have any money.

Filed Feb 7, 2026 · Engine · NY

At 80000miles I noticed misfires and replaced original spark plugs per spec At 107578, misfires occurred, when I pulled plugs pos 1 was completely worn out, as well as pos 4.Codes were seen P0304 and P0301. Car ran well after replacement. I have been troubled by loss of coolant lately and could find no leaks. Also temp gauge in dash “wanders” Being retired I can’t afford to go to dealership. I believe spark plugs should not wear out after approx 25000 miles No overheating of engine has occurred . I drive about 12000/yr. Car is available to be seen. Dealer has not seen car Concerned problem could cause engine failure. Thank you

Filed Oct 5, 2025 · Engine · VA

My wife was driving her car home from work when her car suddenly overheated in light traffic. She pulled over and called me. I came by and we saw that the coolant level was low, so we filled it up to the normal level and she drove it another 20 minutes back to our home. She said it was shuddering the whole way back. I started it in the driveway later that evening and a large amount of white smoke came out of the exhaust pipe and the engine still seemed to be misfiring. I tried starting it again the next day and it would crank but not start. It seems to be an issue with the engine, my guess is a ruptured head gasket. The shuddering caused by the misfires made the car unstable to drive especially if it died while she was at speed with other cars around. The car was towed to a dealer over 30 days ago and they said that it may be related to the open recall, but they won't know until they tear it down. Which they still haven't done. There were no engine codes or prior lamp indications until the overheating event.

Filed Apr 17, 2025 · Engine · MO

The contact's niece owns a 2018 Ford Focus. The contact's niece received notification of the federal safety agency Campaign Number: 23V905000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact stated that after his niece started the vehicle, the engine was misfiring significantly. The contact stated that there was smoke coming from the exhaust pipe, and the vehicle stalled. The check engine warning light was illuminated. The contact stated that the vehicle failed to restart and was towed to the dealer, where it was diagnosed and determined that the failure was related to the recall. The dealer had not provided any diagnostic information and informed the contact that the part had been ordered for the repair. The vehicle was not yet repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not contacted. The failure mileage was unknown. VIN tool confirms parts not available.

Filed Nov 28, 2023 · Brakes, Driver assistance · GA

The brake got stuck and made it very difficult to start the car. Considering it’s a push start. The car then started misfiring and had trouble accelerating. Took it to Ford Auto Nation a few weeks later as it had not advanced, they informed me that the clutch and petal had to be replaced along with a few other parts.

Filed Sep 21, 2023 · Electrical, Engine · 55,000 miles · VA

The contact owns a 2018 Ford Focus. The contact stated while driving approximately 60 MPH, the vehicle suddenly stalled. The vehicle was later taken to the local mechanic who diagnosed that the purge valve was faulty and needed to be replaced. The vehicle was not yet repaired. The contact also indicated that the vehicle had previously experienced rough idling, check engine light illuminated, fuel gauge reading errors, and the Distance to Empty reading was incorrect. The local dealer was notified of the failures. The manufacturer was not notified. The VIN was not included in the federal safety agency Campaign Number: 18V735000 (Fuel System, Gasoline). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 55,000.

Filed Jul 15, 2023 · Engine · WV

July 9, 2023 Rough idle and hesitant to start. No check engine light no codes on reader. Had oil changed as part of routine scheduled maintenance and was told coolant was low and topped off. July 13 noticed coolant at low on coolant reservoir. July 14 car shut off getting off highway driving to work. Check engine light now illuminated. I was able to restart the car but started to overheat and got overheating warning. Turned off ignition and restarted did not get overheating warning until I started driving. 8 hours later coolant reservoir below low line, added coolant and attempted to drive home, car shut off. Having car towed to dealership that replaced the engine. Engine only has 10,000 miles but odometer reads 68,000 Ford says no warranty is on the replacement motor.

Filed Mar 15, 2023 · Fuel system · SC

The check engine light came on and the code reads P0456. The car also has a rough idle and loss of accleration power. We had the car inspected at the mechanic and the shop said the Cannister Purge Valve (CPV) needed replaced and the PCM software needed to be updated. They notified us there was a safety recall on 2012 - 2018 Ford Focus - #18S32 that describes this exact issue, but when we contacted Ford, they said even though our car was a 2018 Ford Focus the VIN # was not included in the recall. Ford suggested we report the issue.

Filed Jun 2, 2022 · Engine · TX

The component that failed is the CANISTER PURGE VALVE. The engine light was on and we took it to a certified auto shop. Report from the auto shop: Diagnosis for check engine lamp on, run tests for codes P0300 random misfire, P0316 misfire on startup, P1450 cannot bleed fuel tank vacuum. No misfires present at this time found sticking canister purge valve pulling a constant vacuum on the fuel tank, makes is possible to pull raw fuel if the fuel level is high, suspect this to be the cause of misfire codes. Recommendation by the auto shop: Replace canister purge valve, clear computer, and retest on cold start.

Filed May 25, 2021 · Fuel system · VA

On 3-28-21 I got an oil change. Shortly after my engine light came on with error code p1450 which it didn't have beforehand. We first took the car to a mechanic and he said that the code is consistent with a known recall for that year and model for a problem with the fuel system. We took it to a Ford dealership to get an evaluation done and they confirmed that the problem was consistent with the recall the mechanic mentioned however there is no recall for my VIN number. When we put gas in the tank and turn it on again, the engine stalls. It runs rough when idle and sometimes has a problem getting up to speed from sitting at traffic lights.