just scanned for codes, this is what i got: p0401, p0170, p0173.

threw a CEL like 10 days ago. havent really been driving it but yesterday when i took it to the gym it got a lot hotter than usual. coolant temp light went on as i was getting home. any ideas? i did the timing belt, water pump, thermostat, etc. last summer so i dont think its that. doesnt drive differently at all. replaced the motor mounts last saturday and i think the CEL came on just before that, not after. any help would be appreciated thanks guys

 

P0401 - Exhaust Gas Recirc.Flow Insufficient Detected
P0170 - Fuel Trim,Bank1 Malfunction
P0173 - Fuel Trim,Bank2 Malfunction

P0401 - Exhaust Gas Recirculation Flow Insufficient Detected
Possible Symptoms

* Drivebility problems (check dtc's with Knock Sensor)
* Irregular behaviour

Possible Causes

* EGR valve stuck closed
* EGR valve leaks vacuum
* EGR flow restricted
* Circuit EGR short to B+
* EGR damaged
* Circuit DPF EGR sensor (differential pressure) disconnected, short to B+ or Ground
* DPF EGR sensor downstream hose off or plugded
* DPF EGR sensor damaged, wrong attached
* Control Module damaged

Possible Solutions

* Check all wiring and connections to and from EGR and DPF-EGR
* Check the EGR: use a vacuumpump and pull open the EGR: rpm should change
* Clean the EGR
* Check / Replace EGR
* Check / Replace DPF-EGR

Special Notes

* The EGR system is monitored when driving at steady state and the EGR is commanded on. When the DPF-EGR sensor indicates that EGR flow is less then a desired minimum a dtc is set.
* N.B. mechanics with less knowledge do exchange the EGR often, but 75% sure the problem will be back (probably the DPF-EGR sensor causes the problem).

I can't find the other two codes (P0170 and P0173 on the Ross-Tech website to get what it might be... but it could be O2 sensors, MAF, or something else...

Josh

 

sweet, thanks josh.

anyone ever replace the egr valve? ill give it a shot but some tips would def. help a brother out.

do you think this could also cause the coolant temp. sensor to give a bad reading (way too hot)? im doing a coolant flush first thing in the morning cause my coolants pretty old and i got a brand new bottle in my garage

 

.....

 

You could try the CTS. It's not expensive and when it goes it does cause weird problems.

josh

 

think this would cause me to overheat? just did a coolant flush and its still getting hot. i should def. use 50/50 water/coolant right?

 

cause me to overheat?

 

http://wiki.ross-tech.com/index.php/16785/P0401
http://wiki.ross-tech.com/index.php?...des&from=01598

 

tons of useful info in that second one... thanks for the link bro!