Hi, I notice that EML was on the other day. Plugged in the diagnostic machine and got these 7 fault codes. Would appreciate any advice you can offer.
Hi Infynity, Here is a link to OBD generic fault codes. You appear to have: P0110 Intake Air Temperature Circuit Malfunction P0300-304 - Intermittent spark plug and specific to cylinder P0335 Crankshaft Position Sensor A Circuit Malfunction Read more at: OBD-II Check Engine Light Trouble Codes
I kept getting the misfire codes and rectified this by fitting new spark plugs. With the sensors i would check the electrical connectors are seated correctly.
New spark plugs/coil packs, then observe. Maybe the intake air temperature sensor is faulty as well, look at the raw data it produces
There are two major codes that you need to address - P0335 (Crankshaft Position Sensor) and P0110 (Air Intake Temp). The misfires can be ignored, as they are a side effect of these two codes - incorrect air temp means premature or no detonation of fuel, and the crankshaft position being out of whack will also cause a misfire. The part number of the Air Temp sensor is 89424-87703, and is located on the top half of the air filter housing. Check the air filter box and see if the cable has been unplugged, damaged or broken. You can open the air filter housing using a needle nose pliers on the clips and some brute force on the pipes... The owners manual says you have to remove the bumper - that's bullshit. The part number for the crankshaft position sensor is 19300-97201 and is mounted to the engine using a single bolt (probably a 10mm bolt). It looks like it's on the left back or side of the engine, below the rocker cover... Look for something with a wire coming out of the engine, and you should find it. If you run a multimeter over the sensor, and it shows zero Omhs / no resistance or the sensor is cracked, the sensor is buggered. Since BOTH the Air Temp and crankshaft sensor are throwing codes, the issue could also be electrical... run over any heavy potholes lately that could have knocked an electrical connection loose?
Interesting, thanks very much for this. Always running over potholes round here. Have cleared the codes and will keep an eye on it for now
While checking the air temp sensor on the filter housing, could also be a good time to check how clean your filter is 9depending on when you last services it). I have just fully serviced "waspy" (Dawn's copen) and although the previous owner said it had been serviced recently, the air filter was black, the plugs sending out errors etc. The only thing that really looked clean was the coolant, but I didn't want to trust that so I changed it anyway. Just gearbox oil to do know and brake fluid.
I too used to get these errors. Sometimes these code readers cannot read the roof/boot ecu so they throw these error codes. Try this: MIL Light on
Hi Neil, I was interested in your advice about the air filter. Can you say if a replacement air filter is easy to obtain and what the part number is please? I get the intermittent misfire from time to time and the car has had new plugs recently, so maybe the reason is elsewhere such as a dirty air filter?
Hi Chris, If you think about it logically, if there is insufficient air going into the combustion chamber (due to a blocked/dirty filter) to ignite and burn properly, then this is going to also have a knock-on effect with the emissions and O2 readings etc. which will in-turn bring up errors. This could be down to a dirty/blocked filter or leak on any of the air/vacuum hoses. I got my filter from through Amazon : JAPANPARTS FA-619S Air Filter It is easy to check your air filter, undo the 3 clips on the filter housing, unplug the sensor connector from the right-hand side of the filter housing lid, push the lid off the large rubber pipe (I used a flat blade screwdriver to do this) and then lift the lid off. Lift out the filter and see if it is dirty or blocked. If so replace it and then re-fit the lid (not forgetting the sensor connector).
Hi Neil, Thank you for the advice. To my surprise and delight, the air filter element was as white as snow, and carried a date in 2014, so it must have been replaced in a recent service! Now just need to get the three new belts sorted.
Were your plugs changed for iridium ones? I would also check all hoses and clips to ensure there are no splits are leaks, as this can affect the air flow as well. Keep an eye on your misfires to see if it is the same cylinder every time or if it is varied. If it is varied, this points towards the system itself, but if it is a cylinder, it could point towards a damaged plug or coil pack.
